feat(aircoding): AirCoding V2 baseline — deterministic multi-agent architecture

Forked from OpenCode v1.17.4 with multi-agent system:
- 5 agents: aircoding, scheduler, worker, architect, reviewer
- Deterministic DAG scheduling engine (coordinator_tick)
- Tool whitelists as hard enforcement
- AirCoding validation plugin
- System prompt injection for routing
- V1 requirements: C4 docs, ADR, AGENTS.md, debug-log.md
- Design documents in docs/

sdks/vscode/.vscodeignore

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+.vscode/**
+.vscode-test/**
+out/**
+node_modules/**
+src/**
+script/**
+.gitignore
+.yarnrc
+bun.lock
+esbuild.js
+vsc-extension-quickstart.md
+**/tsconfig.json
+**/eslint.config.mjs
+**/*.map
+**/*.ts
+**/.vscode-test.*