chore(subagents): log TASK-100 execution handoff

docs/subagents/agents/opencode-task100-dead-code-prune-20260222T033155Z-qenz.md

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+# Agent Session: opencode-task100-dead-code-prune-20260222T033155Z-qenz
+
+- alias: `opencode-task100-dead-code-prune`
+- mission: `Execute TASK-100 dead-code prune and cleanup via writing-plans + executing-plans (no commit).`
+- status: `done`
+- started_utc: `2026-02-22T03:32:21Z`
+- last_update_utc: `2026-02-22T04:00:41Z`
+
+## Intent
+
+- Load TASK-100 from Backlog MCP and capture a concrete execution plan.
+- Run dead-code candidate discovery with import/export checks and safe pruning.
+- Preserve behavior with regression-safe removals and gate verification.
+
+## Planned Files
+
+- `src/**/*.ts`
+- `scripts/**/*.ts`
+- `package.json`
+- `docs/**/*.md`
+- `docs/plans/*.md`
+
+## Files Touched
+
+- `docs/subagents/agents/opencode-task100-dead-code-prune-20260222T033155Z-qenz.md`
+- `docs/subagents/INDEX.md`
+- `docs/subagents/collaboration.md`
+- `docs/plans/2026-02-22-task-100-dead-code-prune-cleanup.md`
+- `docs/reports/2026-02-22-task-100-dead-code-report.md`
+- `src/anki-connect.ts`
+- `src/anki-integration.ts`
+- `src/anki-integration/card-creation.ts`
+- `src/anki-integration/ui-feedback.ts`
+- `src/core/services/anki-jimaku-ipc.ts`
+- `src/core/services/immersion-tracker-service.ts`
+- `src/core/services/ipc-command.ts`
+- `src/renderer/positioning/position-state.ts`
+- `src/tokenizers/index.ts`
+- `src/token-mergers/index.ts`
+- `src/core/utils/index.ts`
+
+## Assumptions
+
+- TASK-100 scope is code/test/docs cleanup only; no feature behavior changes.
+- Existing guardrails (`check:file-budgets`, runtime-cycle check, tests) are available.
+- Parallel subagents can split dead-code scan and docs/report updates safely.
+
+## Phase Log
+
+- `2026-02-22T03:32:21Z` Session started; loaded backlog overview/TASK-100 and subagent coordination files.
+- `2026-02-22T03:39:55Z` Wrote execution plan in `docs/plans/2026-02-22-task-100-dead-code-prune-cleanup.md` and started implementation.
+- `2026-02-22T03:49:20Z` Parallel subagents completed dead-code candidate analysis and safe-removal shortlist.
+- `2026-02-22T04:00:41Z` Completed dead-code removals + report, verified required gates, and finalized TASK-100 as Done in Backlog MCP.
+
+## Next Step
+
+- Finalize TASK-100 in Backlog MCP with report path and verification evidence.