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/ISSUE_TEMPLATE/feature-request.yml

@@ -0,0 +1,19 @@
+name: 🚀 Feature Request
+description: Suggest an idea, feature, or enhancement
+title: "[FEATURE]:"
+
+body:
+  - type: checkboxes
+    id: verified
+    attributes:
+      label: Feature hasn't been suggested before.
+      options:
+        - label: I have verified this feature I'm about to request hasn't been suggested before.
+          required: true
+
+  - type: textarea
+    attributes:
+      label: Describe the enhancement you want to request
+      description: What do you want to change or add? What are the benefits of implementing this? Try to be detailed so we can understand your request better :)
+    validations:
+      required: true