chore(backlog): capture task planning and subagent handoffs

docs/subagents/agents/opencode-task77-sliceb-20260221T232507Z-vzk5.md

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+# Agent: `opencode-task77-sliceb-20260221T232507Z-vzk5`
+
+- alias: `opencode-task77-sliceb`
+- mission: `Implement TASK-77 slice B parser-enrichment stage module + focused tests without touching tokenizer.ts`
+- status: `done`
+- branch: `main`
+- started_at: `2026-02-21T23:25:07Z`
+- heartbeat_minutes: `5`
+
+## Current Work (newest first)
+
+- [2026-02-21T23:27:40Z] complete: added `parser-enrichment-stage.ts` with extracted pure overlap + surface-sequence enrichment helpers and narrow API `enrichTokensWithMecabPos1`; added focused stage tests; verified `bun test src/core/services/tokenizer/parser-enrichment-stage.test.ts` passes (3/3).
+- [2026-02-21T23:26:40Z] tdd: created `parser-enrichment-stage.test.ts` first; confirmed RED due to missing module; then implemented stage module to GREEN.
+- [2026-02-21T23:25:07Z] intent: extract pure MeCab pos1 enrichment logic into dedicated stage module, add focused stage tests, run requested target test command.
+- [2026-02-21T23:25:07Z] progress: loaded Backlog overview + TASK-77 context; preparing red-first tests for parser enrichment stage.
+
+## Files Touched
+
+- `docs/subagents/agents/opencode-task77-sliceb-20260221T232507Z-vzk5.md`
+- `docs/subagents/INDEX.md`
+- `docs/subagents/collaboration.md`
+- `src/core/services/tokenizer/parser-enrichment-stage.ts`
+- `src/core/services/tokenizer/parser-enrichment-stage.test.ts`
+
+## Assumptions
+
+- `TASK-77` remains active and this request maps to implementation plan step 2.
+- Scope excludes edits to `src/core/services/tokenizer.ts` in this slice.
+
+## Open Questions / Blockers
+
+- None.
+
+## Next Step
+
+- Handoff slice-B result to user; no tokenizer orchestrator edits in this slice.