Initial commit: AirCoding V1.0.0 Alpha architecture baseline

Complete architecture document set with multi-model review remediation:
- Frozen interface contracts, runtime semantics, DB schemas
- Event/tool/error/provider registries
- Scheduler and main agent state machines
- C4 module/code views, solution architecture, baseline V1
- Multi-model review reports and joint assessment
- Phase-gate remediation complete (P0/P1/P2/UX resolved)
- Implementation plan with T-000A through T-045
- Reference folders kept as placeholders only

AirPlan/docs/architecture/adr/ADR-0005-use-independent-worker-processes-and-ndjson-ipc.md

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+# ADR-0005: Use Independent Worker Processes And NDJSON IPC
+
+- Status: Accepted
+- Date: 2026-05-27
+
+## Context
+
+A single agent process doing all work would cause context explosion, reduce responsiveness, and make parallel execution fragile. AirCoding needs workers that can be monitored, retried, cancelled, and recovered independently.
+
+## Decision
+
+Run Executor, Reviewer, Debugger, Compactor, and ExperienceMiner as independent Bun child processes. Use NDJSON over stdio for IPC.
+
+IPC messages use:
+
+```text
+kind: event
+kind: control
+kind: log
+```
+
+The Scheduler owns process lifecycle, heartbeat monitoring, timeout handling, and WorkerResult collection.
+
+## Consequences
+
+- Main Agent remains responsive.
+- Workers have bounded task context.
+- Scheduler can detect lost workers through heartbeat/process state.
+- stdout is reserved for protocol; stderr is crash/fatal fallback.
+- Worker loops may be role-specific rather than one generic shared loop.