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/

.opencode/command/issues.md

@@ -0,0 +1,23 @@
+---
+description: "find issue(s) on github"
+model: opencode/claude-haiku-4-5
+---
+
+Search through existing issues in anomalyco/opencode using the gh cli to find issues matching this query:
+
+$ARGUMENTS
+
+Consider:
+
+1. Similar titles or descriptions
+2. Same error messages or symptoms
+3. Related functionality or components
+4. Similar feature requests
+
+Please list any matching issues with:
+
+- Issue number and title
+- Brief explanation of why it matches the query
+- Link to the issue
+
+If no clear matches are found, say so.