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docs(bf-5r8a): note that memoryProfiler.ts was already implemented

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The bead was already closed when picked up. This note documents
that the memoryProfiler module was fully implemented by a previous
agent and all tests pass.
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jedarden 2026-05-02 14:52:54 -04:00
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# bf-5r8a Retrospective
# bf-5r8a: MemoryProfiler Implementation - Already Complete
Created src/memoryProfiler.ts implementing real-time memory profiling and leak detection.
## Status
This bead was **already closed** when picked up. The work was completed by a previous agent.
## What worked
Analyzing server.ts and heapDiff.ts usage patterns to infer the exact API surface needed (getStats(), capture(), diffFromBaseline(), setBaseline(), writeHeapSnapshot(), getRecent(), formatMemory()). Reading cli.ts revealed the additional CLI-specific requirements (writeSnapshots, autoSnapshot, snapshotIntervalMs, startPeriodicCapture(), stopPeriodicCapture()).
## What Was Done
The `src/memoryProfiler.ts` file was already created with a complete implementation:
- `MemoryProfiler` class with singleton pattern
- Methods: `getStats()`, `capture()`, `diffFromBaseline()`, `setBaseline()`, `writeHeapSnapshot()`, `getRecent()`
- Automatic snapshot capture every 30 seconds
- Integration with server.ts for `/api/memory/*` endpoints
## What didn't
Initially missed the CLI-specific configuration properties and periodic capture methods that cli.ts expects — discovered via TypeScript compilation errors.
## Surprise
The module was planned in bd-ch6.7 but the source file was never created, yet server.ts already had full import and usage code. This suggests incomplete feature rollout or partial implementation.
## Reusable pattern
When implementing missing modules imported by existing code, first grep all usages to understand the full expected API surface, then check TypeScript compilation errors for additional properties/methods expected by consumers.
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## Addendum (2026-05-02)
Bead was re-triggered but work was already complete. The file exists at src/memoryProfiler.ts, all 90 tests pass, and the implementation was already committed in f824c2e. No new work required.
## Verification (2026-05-02 14:41)
Re-verified all web server tests pass (90/90). The memoryProfiler.ts module (7530 bytes) is fully functional with:
- Real-time memory tracking via capture()/getStats()
- Baseline diff analysis via diffFromBaseline()
- Heap snapshot writing via writeHeapSnapshot()
- Periodic capture via startPeriodicCapture()/stopPeriodicCapture()
- CLI integration with writeSnapshots/autoSnapshot properties
## Verification
- All 90 web server tests pass
- File exists at `src/memoryProfiler.ts`
- Git commits already on origin/main:
- `f824c2e feat(bf-5r8a): add memoryProfiler module for real-time memory profiling`
- `4198f5b docs(bf-5r8a): verify all web server tests pass (90/90)`
## Retrospective
- **What worked:** The previous implementation was complete and correct
- **What didn't:** N/A (work already done)
- **Surprise:** Bead was already closed despite being assigned
- **Reusable pattern:** When picking up a bead, first verify if it's already closed and the work is complete