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-0006-align-execution-layer-with-claude-code.md

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+# ADR-0006: Align Execution Layer With Claude Code Quality Discipline
+
+- Status: Accepted
+- Date: 2026-05-27
+
+## Context
+
+AirCoding's usefulness depends heavily on safe, correct code modifications. The user explicitly prioritized Claude Code-level execution quality over broad but loose tool behavior.
+
+## Decision
+
+Align execution-layer primitives with Claude Code as much as possible:
+
+- read before edit
+- exact conservative replacements
+- small patches
+- no unrelated refactors
+- no premature abstractions
+- schema-validated tool use
+- permission checks before side effects
+- verification before completion
+- build/test/debug evidence collection
+- root-cause failure diagnosis
+- explicit blocker escalation for architecture/interface conflicts
+
+## Consequences
+
+- `fs.edit`, `fs.patch`, `shell.run`, WorkerResult, and review gates must preserve this discipline.
+- Codex/OpenCode may inform tool breadth/UI/runtime ideas, but not at the cost of execution quality.
+- Workers should fail or block rather than guessing unsafe edits.