chore(backlog): capture task planning and subagent handoffs

docs/subagents/agents/opencode-task72-parse-details-20260221T232137Z-b63t.md

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+# Agent: `opencode-task72-parse-details-20260221T232137Z-b63t`
+
+- alias: `opencode-task72-parse-details`
+- mission: `Implement TASK-72 Task 2 shared parse-error formatter wiring and tests`
+- status: `done`
+- branch: `main`
+- started_at: `2026-02-21T23:21:37Z`
+- heartbeat_minutes: `5`
+
+## Current Work (newest first)
+
+- [2026-02-21T23:24:12Z] completed: added shared `buildConfigParseErrorDetails` formatter, rewired startup hot-reload parse-failure branch to use it, expanded tests in `config-validation.test.ts` and `runtime/startup-config.test.ts`; verification passed (`bun run build && node --test dist/main/config-validation.test.js dist/main/runtime/startup-config.test.js`).
+- [2026-02-21T23:21:37Z] intent: implement Task 2 from `docs/plans/2026-02-21-task-72-strict-startup-config-loading.md`; scope `src/main/config-validation.ts`, `src/main/runtime/startup-config.ts`, and related tests; run required build+node-test command.
+
+## Files Touched
+
+- `docs/subagents/INDEX.md`
+- `docs/subagents/collaboration.md`
+- `docs/subagents/agents/opencode-task72-parse-details-20260221T232137Z-b63t.md`
+- `src/main/config-validation.ts`
+- `src/main/runtime/startup-config.ts`
+- `src/main/config-validation.test.ts`
+- `src/main/runtime/startup-config.test.ts`
+
+## Assumptions
+
+- Backlog ticket exists: `TASK-72` (`To Do`), and this run is scoped to Task 2 only.
+- Existing startup/hot-reload fail handlers remain source of truth for fatal behavior.
+
+## Open Questions / Blockers
+
+- None.
+
+## Next Step
+
+- Handoff complete for Task 2 scope.