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

reference/atuin-18.16.1/.cargo/audit.toml

@@ -0,0 +1,9 @@
+[advisories]
+ignore = [
+  # This is a vuln on RSA. RSA is in our lockfile, but not in cargo-tree. 
+  # It is a issue with sqlx/cargo, and does not affect Atuin.
+  # See:
+  # - https://github.com/launchbadge/sqlx/issues/3211
+  # - https://github.com/rust-lang/cargo/issues/10801
+  "RUSTSEC-2023-0071"
+]