docs: add project docs, GitHub DX, fire-tools stamp

- CLAUDE.md with commands, structure, key constraints
- .claude/rules/ coding standards + workflows
- docs/architecture.md with design decisions
- .github/ CI workflow, issue templates, PR template
- LICENSE (MIT)
- .fire-tools.json initialization stamp
- README.md rewritten with features, quick start, stack table

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -0,0 +1,24 @@
+name: Feature request
+description: Suggest a new feature or improvement
+labels: [enhancement]
+body:
+  - type: textarea
+    id: problem
+    attributes:
+      label: What problem does this solve?
+      description: Describe the use case or pain point.
+    validations:
+      required: true
+
+  - type: textarea
+    id: proposal
+    attributes:
+      label: Proposed solution
+      description: What would you like to see?
+    validations:
+      required: true
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives considered