fix(bridge): rawRPC direct polling + SDK analysis docs + trial-and-error log

- Root cause: getDiagnostics.lastStepIndex is stale, SDK EventMonitor cannot detect real-time step changes
- Fix: Direct rawRPC('GetCascadeTrajectorySteps') polling every 5s
- Relay: PLANNER_RESPONSE, NOTIFY_USER, TASK_BOUNDARY, WAITING steps
- Added: docs/discord-bridge-analysis.md (full SDK architecture analysis)
- Added: docs/devlog/entries/20260308-003.md (trial-and-error history)
- Added: antigravity-sdk-main/ source reference
- Vikunja: #252 done, #253 created, #251 commented

antigravity-sdk-main/.github/FUNDING.yml

@@ -0,0 +1,2 @@
+custom:
+  - https://github.com/Kanezal/antigravity-sdk#support

antigravity-sdk-main/.github/workflows/docs.yml

@@ -0,0 +1,49 @@
+name: Deploy TypeDoc to GitHub Pages
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - 'src/**'
+      - 'package.json'
+      - 'tsconfig.json'
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: pages
+  cancel-in-progress: false
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: npm
+          cache-dependency-path: package-lock.json
+
+      - run: npm ci
+
+      - run: npx typedoc --out docs-site src/index.ts --tsconfig tsconfig.json
+
+      - uses: actions/upload-pages-artifact@v3
+        with:
+          path: docs-site
+
+  deploy:
+    needs: build
+    runs-on: ubuntu-latest
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - id: deployment
+        uses: actions/deploy-pages@v4