chore: enable repo automation (CodeRabbit + release-please)

.coderabbit.yaml

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+language: en-US           # review comments in English
+reviews:
+  profile: chill          # assertive = stricter / chill = more restrained; chill suits solo
+  request_changes_workflow: false   # don't hard-block with request changes (avoid self-gating)
+  high_level_summary: true
+  poem: false             # disable the default poem
+  auto_review:
+    enabled: true
+    base_branches:
+      - dev
+      - main
+  path_instructions:
+    - path: "backend/**"
+      instructions: "Minimal API only, no Controllers. Dapper query-only, no EF Core. All JSON fields camelCase. Push calculations into Postgres views."
+    - path: "frontend/**"
+      instructions: "React functional components + TanStack Query hooks in src/api/suburbs.ts. Tailwind v4 with the Nocturne design tokens."
+    - path: "agent/**"
+      instructions: "LangGraph + LangChain. Keep the deterministic guard layers offline and API-free."
+chat:
+  auto_reply: true

.github/.release-please-manifest.json

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+{
+  ".": "1.0.0"
+}

.github/release-please-config.json

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+{
+  "$schema": "https://raw.githubusercontent.com/googleapis/release-please/main/schemas/config.json",
+  "release-type": "simple",
+  "packages": {
+    ".": {
+      "package-name": "suburblens",
+      "changelog-path": "CHANGELOG.md"
+    }
+  },
+  "changelog-sections": [
+    { "type": "feat", "section": "Features" },
+    { "type": "fix", "section": "Bug Fixes" },
+    { "type": "perf", "section": "Performance" },
+    { "type": "refactor", "section": "Refactors" },
+    { "type": "docs", "section": "Documentation" },
+    { "type": "chore", "section": "Miscellaneous", "hidden": true }
+  ]
+}

.github/workflows/release-please.yml

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+name: release-please
+
+on:
+  push:
+    branches: [main]
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  release-please:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: googleapis/release-please-action@v4
+        with:
+          config-file: .github/release-please-config.json
+          manifest-file: .github/.release-please-manifest.json