chore(backlog): capture task planning and subagent handoffs

docs/subagents/agents/opencode-task80-ipc-contract-20260222T001728Z-obrv.md

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+# Agent Session: opencode-task80-ipc-contract-20260222T001728Z-obrv
+
+- alias: `opencode-task80-ipc-contract`
+- mission: `Execute TASK-80 IPC contract typing + runtime payload validation via writing-plans + executing-plans (no commit).`
+- status: `planning`
+- started_utc: `2026-02-22T00:17:28Z`
+- last_update_utc: `2026-02-22T00:17:28Z`
+
+## Intent
+
+- Load TASK-80 from Backlog MCP and capture implementation plan before edits.
+- Strengthen typed IPC channel contracts and runtime payload validation at boundaries.
+- Reduce unsafe `unknown` casts in IPC handlers and add malformed payload coverage.
+
+## Planned Files
+
+- `src/main/ipc.ts`
+- `src/main/runtime/*`
+- `src/shared/ipc/*`
+- `src/main/**/*.test.ts`
+- `docs/architecture.md`
+
+## Assumptions
+
+- TASK-80 scope is main-process IPC boundary; keep external behavior/backward compatibility.
+- Existing validation helpers may exist and should be reused over introducing heavy deps.
+- Parallel subagents can split contracts/validation/tests/docs with non-overlapping files.
+
+## Phase Log
+
+- `2026-02-22T00:17:28Z` Session started; read backlog overview and TASK-80 details; beginning planning.