docs: Create P3 design and update baseline tag
Created P3-DESIGN.md with scope for: - P3.1: Performance optimization & metrics - P3.2: Enhanced observability - P3.3: Developer experience improvements - P3.4: Documentation polish Updated baseline tag reference to v1.0.11-p2.3-p1.5b-complete P3 focuses on polish, performance, and developer experience while maintaining all established invariants.
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Matthew Raymer
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docs/progress/P3-DESIGN.md
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docs/progress/P3-DESIGN.md
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# P3 Design: Performance, Observability & Developer Experience
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**Purpose:** Defines scope, boundaries, and acceptance criteria for P3 work before implementation begins.
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**Owner:** Development Team
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**Last Updated:** 2025-12-22
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**Status:** design-only (no implementation)
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**Baseline:** `v1.0.11-p2.3-p1.5b-complete`
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---
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## Purpose
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This document defines the **scope, boundaries, and acceptance criteria** for P3 work **before any implementation begins**. It ensures P3:
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- Does not violate established invariants
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- Has clear "done" criteria
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- Can be executed incrementally
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- Maintains the stability achieved in P0/P1/P2
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- Focuses on polish, performance, and developer experience
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---
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## P3 Scope Definition
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### What P3 Includes
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**P3.1 — Performance Optimization & Metrics**
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- Add performance metrics collection (timing, memory, database operations)
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- Optimize critical paths (scheduling, recovery, database queries)
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- Document performance characteristics and benchmarks
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- Add performance regression tests
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**P3.2 — Enhanced Observability**
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- Expand event logging coverage (missing edge cases)
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- Add structured metrics export (for dashboards/monitoring)
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- Improve error context (stack traces, state snapshots)
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- Add diagnostic mode for troubleshooting
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**P3.3 — Developer Experience Improvements**
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- Improve error messages (actionable, context-rich)
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- Add development mode helpers (debug logging, state inspection)
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- Enhance TypeScript types (better IntelliSense, stricter contracts)
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- Add integration examples and quick-start guides
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**P3.4 — Documentation Polish**
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- API documentation improvements (JSDoc completeness)
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- Add troubleshooting guides (common issues, solutions)
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- Improve onboarding documentation (getting started, architecture overview)
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- Add migration guides (version upgrades, breaking changes)
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### What P3 Excludes
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- **No new features** — P3 is polish, not expansion
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- **No architectural changes** — Core structure remains unchanged
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- **No breaking API changes** — Backward compatibility required
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- **No new platforms** — Focus on existing iOS/Android/Web
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- **No new dependencies** — Minimize external additions (prefer built-in solutions)
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---
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## Invariants That Must Not Be Violated
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All invariants from P0/P1/P2 remain in force:
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1. **Packaging Invariants (P0)** — No forbidden files, exports correct
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2. **Core Module Purity (P1.4)** — No platform imports in `src/core/`
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3. **CI Authority (P0)** — `./ci/run.sh` remains authoritative
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4. **Export Correctness (P0)** — All exports match artifacts
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5. **Documentation Structure (P1.5)** — Index-first rule followed
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6. **Baseline Tag Integrity** — Tags represent known-good states
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**Enforcement:** All P3 work must pass `./ci/run.sh` before merging.
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---
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## P3 Work Items
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### P3.1: Performance Optimization & Metrics
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**Goal:** Measure, optimize, and document performance characteristics.
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**Current State:**
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- No explicit performance metrics collection
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- No performance regression tests
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- Performance characteristics undocumented
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**Scope:**
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- Add timing metrics for critical operations:
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- Schedule creation/update
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- Notification delivery
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- Recovery operations
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- Database queries
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- Add memory usage tracking (optional, platform-specific)
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- Optimize identified bottlenecks:
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- Database query patterns
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- Notification scheduling overhead
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- Recovery path efficiency
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- Document performance characteristics:
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- Expected operation times
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- Memory footprint
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- Platform-specific considerations
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- Add performance regression tests:
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- Baseline metrics collection
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- CI integration (warn on regressions)
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**Constraints:**
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- Must not add significant overhead (metrics collection must be lightweight)
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- Must be opt-in or development-only (production impact minimal)
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- Must not break existing functionality
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- Must be cross-platform compatible
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**Acceptance Criteria:**
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- [ ] Performance metrics collection implemented (timing, optional memory)
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- [ ] Critical paths optimized (at least 2 identified bottlenecks addressed)
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- [ ] Performance characteristics documented (expected times, memory footprint)
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- [ ] Performance regression tests added (baseline + CI integration)
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- [ ] No performance regressions introduced (verified via tests)
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**Estimated Effort:** Medium (2-3 days)
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---
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### P3.2: Enhanced Observability
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**Goal:** Improve visibility into plugin behavior for debugging and monitoring.
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**Current State:**
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- Event logging exists but may have gaps
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- No structured metrics export
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- Error context could be richer
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- No diagnostic mode
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**Scope:**
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- Expand event logging coverage:
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- Missing edge cases (if any)
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- Background task execution
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- Recovery operations
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- State transitions
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- Add structured metrics export:
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- JSON export of metrics
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- Integration with monitoring systems (optional)
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- Historical metrics (if storage available)
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- Improve error context:
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- Stack traces (where available)
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- State snapshots (relevant context)
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- Operation context (what was happening)
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- Add diagnostic mode:
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- Verbose logging toggle
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- State inspection helpers
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- Debug information export
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**Constraints:**
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- Must not expose sensitive data (user content, tokens)
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- Must be opt-in (diagnostic mode)
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- Must not impact production performance
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- Must be cross-platform compatible
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**Acceptance Criteria:**
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- [ ] Event logging coverage expanded (all critical paths covered)
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- [ ] Structured metrics export implemented (JSON format)
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- [ ] Error context improved (stack traces, state snapshots)
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- [ ] Diagnostic mode added (verbose logging, state inspection)
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- [ ] Documentation updated (how to use observability features)
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**Estimated Effort:** Medium (2-3 days)
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---
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### P3.3: Developer Experience Improvements
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**Goal:** Make the plugin easier to use, debug, and integrate.
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**Current State:**
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- Error messages could be more actionable
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- TypeScript types are good but could be stricter
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- Limited development helpers
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- Integration examples exist but could be expanded
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**Scope:**
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- Improve error messages:
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- Actionable guidance (what to do next)
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- Context-rich (what went wrong, why)
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- Platform-specific hints (iOS vs Android differences)
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- Add development mode helpers:
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- Debug logging toggle
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- State inspection methods
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- Test data injection helpers
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- Enhance TypeScript types:
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- Stricter contracts (discriminated unions where appropriate)
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- Better IntelliSense (JSDoc improvements)
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- Type guards for runtime validation
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- Add integration examples:
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- Quick-start guide (minimal working example)
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- Common patterns (scheduling, recovery, error handling)
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- Platform-specific examples (iOS, Android, Web)
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**Constraints:**
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- Must maintain backward compatibility
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- Must not add production overhead (development helpers only)
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- Must be cross-platform compatible
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- Must not break existing integrations
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**Acceptance Criteria:**
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- [ ] Error messages improved (actionable, context-rich)
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- [ ] Development mode helpers added (debug logging, state inspection)
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- [ ] TypeScript types enhanced (stricter contracts, better IntelliSense)
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- [ ] Integration examples expanded (quick-start, common patterns)
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- [ ] Documentation updated (developer experience improvements)
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**Estimated Effort:** Medium (2-3 days)
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---
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### P3.4: Documentation Polish
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**Goal:** Improve documentation completeness, clarity, and discoverability.
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**Current State:**
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- API documentation exists but may have gaps
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- Troubleshooting guides are minimal
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- Onboarding documentation could be improved
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- Migration guides may be missing
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**Scope:**
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- API documentation improvements:
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- JSDoc completeness (all public APIs documented)
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- Parameter descriptions (types, constraints, examples)
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- Return value documentation (types, possible values)
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- Error documentation (when errors occur, what they mean)
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- Add troubleshooting guides:
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- Common issues (with solutions)
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- Platform-specific issues (iOS vs Android)
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- Debugging steps (how to diagnose problems)
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- FAQ (frequently asked questions)
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- Improve onboarding documentation:
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- Getting started guide (step-by-step)
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- Architecture overview (high-level design)
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- Key concepts (scheduling, recovery, persistence)
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- Integration checklist
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- Add migration guides:
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- Version upgrade guides (breaking changes)
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- API migration (deprecated → new APIs)
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- Configuration migration (old → new config)
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**Constraints:**
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- Must maintain accuracy (docs must match code)
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- Must be discoverable (linked from index)
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- Must be maintainable (drift guards, review process)
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- Must not duplicate existing content
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**Acceptance Criteria:**
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- [ ] API documentation complete (all public APIs have JSDoc)
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- [ ] Troubleshooting guides added (common issues, solutions)
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- [ ] Onboarding documentation improved (getting started, architecture)
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- [ ] Migration guides added (version upgrades, API changes)
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- [ ] Documentation index updated (all new docs linked)
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**Estimated Effort:** Medium (2-3 days)
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---
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## P3 Execution Strategy
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### Phase Ordering
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**Recommended sequence:**
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1. **P3.1 First (Performance)**
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- Measure first (add metrics collection)
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- Identify bottlenecks
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- Optimize critical paths
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- Document characteristics
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- **Checkpoint:** Run `./ci/run.sh`, update progress docs
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2. **P3.2 Second (Observability)**
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- Expand event logging
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- Add metrics export
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- Improve error context
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- Add diagnostic mode
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- **Checkpoint:** Run `./ci/run.sh`, update progress docs
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3. **P3.3 Third (Developer Experience)**
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- Improve error messages
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- Add development helpers
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- Enhance TypeScript types
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- Expand examples
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- **Checkpoint:** Run `./ci/run.sh`, update progress docs
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4. **P3.4 Fourth (Documentation)**
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- Complete API docs
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- Add troubleshooting guides
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- Improve onboarding
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- Add migration guides
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- **Checkpoint:** Run `./ci/run.sh`, update progress docs
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### Incremental Approach
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- Each P3 item can be completed independently
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- No strict dependencies between items
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- Each item has its own acceptance criteria
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- Can pause/resume at any item boundary
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### Testing Strategy
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- **P3.1:** Performance regression tests required
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- **P3.2:** Observability features must be testable
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- **P3.3:** Developer helpers must not break existing functionality
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- **P3.4:** Documentation review (no code changes, but accuracy checks)
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---
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## P3 "Done" Criteria
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### Overall P3 Completion
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P3 is complete when:
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1. **All P3 items completed** (P3.1, P3.2, P3.3, P3.4)
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2. **All invariants preserved** (verified by CI)
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3. **All acceptance criteria met** (per item)
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4. **Documentation updated** (progress docs, index, changelog)
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5. **Baseline tag created** (if desired: `v1.0.11-p3-complete`)
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### Individual Item Completion
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Each P3 item is complete when:
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- [ ] Acceptance criteria met
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- [ ] CI passes (`./ci/run.sh`)
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- [ ] No invariant violations
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- [ ] Documentation updated (if applicable)
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- [ ] Performance tests pass (for P3.1)
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---
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## Risk Mitigation
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### Performance Overhead
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**Risk:** Metrics collection adds overhead
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**Mitigation:** Make metrics opt-in or development-only, use lightweight collection
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### Breaking Changes
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**Risk:** Developer experience improvements break existing code
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**Mitigation:** Maintain backward compatibility, add deprecation warnings
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### Documentation Drift
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**Risk:** Documentation becomes outdated
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**Mitigation:** Drift guards, review process, link from index
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### Scope Creep
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**Risk:** P3 expands beyond polish into features
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**Mitigation:** Strict scope definition, "what P3 excludes" section
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---
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## Success Metrics
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### Performance (P3.1)
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- Critical operations complete within expected timeframes
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- No performance regressions introduced
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- Performance characteristics documented
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### Observability (P3.2)
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- All critical paths have event logging
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- Error context is actionable
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- Diagnostic mode is useful for troubleshooting
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### Developer Experience (P3.3)
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- Error messages are actionable
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- TypeScript types provide good IntelliSense
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- Integration examples are clear and helpful
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### Documentation (P3.4)
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- All public APIs are documented
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- Troubleshooting guides are comprehensive
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- Onboarding is smooth for new developers
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---
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## Next Steps After P3
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Potential future phases (not in scope for P3):
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- **P4.x:** New features (if needed)
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- **P5.x:** Platform expansion (if needed)
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- **P6.x:** Major architectural changes (if needed)
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**Decision:** Defer until P3 completion and review.
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---
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**Last Updated:** 2025-12-22
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**Status:** Design-only (awaiting approval before implementation)
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