chore: CI, branch protection, issue/PR templates, README demo GIF

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug report
+description: Something isn't working as expected
+labels: [bug]
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: What happened?
+      description: A clear description of the bug.
+    validations:
+      required: true
+
+  - type: textarea
+    id: reproduction
+    attributes:
+      label: Steps to reproduce
+      placeholder: |
+        1. Start opencode
+        2. Open Agentree
+        3. ...
+    validations:
+      required: true
+
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected behavior
+    validations:
+      required: true
+
+  - type: input
+    id: version
+    attributes:
+      label: opencode version
+      placeholder: e.g. 1.3.13

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature request
+description: Suggest an improvement or new capability
+labels: [enhancement]
+body:
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem or motivation
+      description: What are you trying to do that you can't do today?
+    validations:
+      required: true
+
+  - type: textarea
+    id: solution
+    attributes:
+      label: Proposed solution
+    validations:
+      required: true
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives considered

.github/pull_request_template.md

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+Closes #<!-- issue number -->
+
+## What
+
+<!-- What does this PR change? -->
+
+## Why
+
+<!-- Why is this change needed? Link the issue above if not self-evident. -->
+
+## Test plan
+
+<!-- How was this tested? -->
+- [ ] `pnpm test` passes
+- [ ] `pnpm exec tsc --noEmit` passes
+- [ ] Manually verified in browser

.github/workflows/ci.yml

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+name: ci
+
+on:
+  pull_request:
+    branches: [main]
+
+jobs:
+  ci:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: pnpm/action-setup@v4
+        with:
+          version: 9
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: pnpm
+
+      - name: Install dependencies
+        run: pnpm install
+
+      - name: Type check (server)
+        run: pnpm exec tsc --noEmit
+
+      - name: Type check (client)
+        run: pnpm exec tsc --noEmit -p tsconfig.client.json
+
+      - name: Test
+        run: pnpm test