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/

.github/TEAM_MEMBERS

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+adamdotdevin
+Brendonovich
+fwang
+Hona
+iamdavidhill
+jayair
+jlongster
+kitlangton
+kommander
+MrMushrooooom
+nexxeln
+R44VC0RP
+rekram1-node
+thdxr
+simonklee
+vimtor
+starptech