chore(backlog): capture task planning and subagent handoffs

docs/subagents/agents/opencode-task77-slice-a-20260222T000100Z-j4p2.md

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+# Agent: `opencode-task77-slice-a-20260222T000100Z-j4p2`
+
+- alias: `opencode-task77-slice-a`
+- mission: `Implement TASK-77 slice A parser-selection-stage module + focused tests without touching tokenizer.ts`
+- status: `done`
+- branch: `main`
+- started_at: `2026-02-22T00:01:00Z`
+- heartbeat_minutes: `5`
+
+## Current Work (newest first)
+
+- [2026-02-22T00:01:00Z] intent: extract pure parse-result selection logic from `src/core/services/tokenizer.ts` into new stage module and add focused tests for selection behavior.
+- [2026-02-22T00:01:00Z] plan: write failing tests first in `src/core/services/tokenizer/parser-selection-stage.test.ts`, then add module `src/core/services/tokenizer/parser-selection-stage.ts`, then run targeted test command.
+- [2026-02-22T00:03:30Z] complete: added pure parser selection stage module + helper exports and focused tests for scanning preference, mecab fallback split, and suspicious-kana tie-break; verified with `bun test src/core/services/tokenizer/parser-selection-stage.test.ts` (3 pass, 0 fail).
+
+## Files Touched
+
+- `docs/subagents/agents/opencode-task77-slice-a-20260222T000100Z-j4p2.md`
+- `docs/subagents/INDEX.md`
+- `docs/subagents/collaboration.md`
+- `src/core/services/tokenizer/parser-selection-stage.ts`
+- `src/core/services/tokenizer/parser-selection-stage.test.ts`
+
+## Assumptions
+
+- TASK-77 already exists in Backlog (`task_search` hit confirmed).
+- Slice A should preserve existing behavior from tokenizer parse candidate selection path only.
+
+## Open Questions / Blockers
+
+- None.
+
+## Next Step
+
+- Handoff complete.