refactor: reorganize into monorepo with separate subprojects

Structure webber into three independent subprojects:
- webber-api/: FastAPI backend server with all agent code
- webber-cli/: Standalone CLI client (renamed from cli/ to webber_cli/)
- webber-sandbox/: Test project for functional testing

Key changes:
- Each subproject has its own .venv (Python 3.12+)
- Added sandbox.sh for managing test project templates
- Created sandbox-templates/ with calculator-cli and empty starter
- Updated CI/CD for prefixed tags (api/v*, cli/v*)
- Added comprehensive AGENTS.md with operational instructions
- Added gitignore filtering to glob and grep tools
- Created pyproject.toml for each subproject

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.gitea/workflows/build-api.yml

@@ -1,20 +1,31 @@
-name: Build and Push
+name: Build and Push API
 
 on:
   push:
     tags:
-      - 'v*'
+      - 'api/v*'
+
+env:
+  IMAGE_NAME: git.schweitz.internal/jpmschweitzer/webber-api
 
 jobs:
   release:
     runs-on: ubuntu-latest
     steps:
+      - name: Extract version from tag
+        id: version
+        run: |
+          # Extract version from api/v0.3.0 -> v0.3.0
+          VERSION="${{ github.ref_name }}"
+          VERSION="${VERSION#api/}"
+          echo "version=$VERSION" >> $GITHUB_OUTPUT
+
       - name: Create Gitea Release
         run: |
           curl -sf -X POST \
             -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" \
             -H "Content-Type: application/json" \
-            -d '{"tag_name": "${{ github.ref_name }}", "name": "Release ${{ github.ref_name }}", "body": "Automated release for ${{ github.ref_name }}"}' \
+            -d '{"tag_name": "${{ github.ref_name }}", "name": "API Release ${{ steps.version.outputs.version }}", "body": "Automated release for webber-api ${{ steps.version.outputs.version }}"}' \
             "${{ github.server_url }}/api/v1/repos/${{ github.repository }}/releases"
 
   build:
@@ -23,6 +34,13 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      - name: Extract version from tag
+        id: version
+        run: |
+          VERSION="${{ github.ref_name }}"
+          VERSION="${VERSION#api/}"
+          echo "version=$VERSION" >> $GITHUB_OUTPUT
+
       - name: Login to Gitea Registry
         uses: docker/login-action@v3
         with:
@@ -33,11 +51,11 @@ jobs:
       - name: Build and push
         uses: docker/build-push-action@v5
         with:
-          context: .
+          context: ./webber-api
           push: true
           tags: |
-            git.schweitz.internal/jpmschweitzer/webber:latest
-            git.schweitz.internal/jpmschweitzer/webber:${{ github.ref_name }}
+            ${{ env.IMAGE_NAME }}:latest
+            ${{ env.IMAGE_NAME }}:${{ steps.version.outputs.version }}
 
       - name: Trigger Watchtower update
         if: success()

.gitea/workflows/build-cli.yml

@@ -0,0 +1,25 @@
+name: Build and Release CLI
+
+on:
+  push:
+    tags:
+      - 'cli/v*'
+
+# TODO: Implement CLI installer build
+# This workflow will be implemented when CLI distribution is ready.
+# Possible targets:
+# - PyPI package
+# - Standalone binary (PyInstaller)
+# - Platform-specific installers
+
+jobs:
+  placeholder:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Extract version from tag
+        id: version
+        run: |
+          VERSION="${{ github.ref_name }}"
+          VERSION="${VERSION#cli/}"
+          echo "CLI release triggered for version: $VERSION"
+          echo "TODO: Implement CLI build and distribution"