ci: add PR size and title checks, configure commitizen

.github/workflows/pr-size.yml

@@ -0,0 +1,32 @@
+name: PR Size Check
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+jobs:
+  pr-size:
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+    steps:
+      - uses: codelytv/pr-size-labeler@v1
+        with:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          xs_label: "size/XS"
+          xs_max_size: 25
+          s_label: "size/S"
+          s_max_size: 100
+          m_label: "size/M"
+          m_max_size: 250
+          l_label: "size/L"
+          l_max_size: 500
+          xl_label: "size/XL"
+          fail_if_xl: false
+          files_to_ignore: |
+            uv.lock
+            *.lock
+            lib/crewai/src/crewai/cli/templates/**
+            **/*.json
+            **/test_durations/**
+            **/cassettes/**

.github/workflows/pr-title.yml

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+name: PR Title Check
+
+on:
+  pull_request:
+    types: [opened, edited, synchronize, reopened]
+
+permissions:
+  contents: read
+  pull-requests: read
+
+jobs:
+  pr-title:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: amannn/action-semantic-pull-request@v5
+        continue-on-error: true
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          types: |
+            feat
+            fix
+            refactor
+            perf
+            test
+            docs
+            chore
+            ci
+            style
+            revert
+          requireScope: false
+          subjectPattern: ^[a-z].+[^.]$
+          subjectPatternError: >
+            The PR title "{title}" does not follow conventional commit format.
+
+            Expected: <type>(<scope>): <lowercase description without trailing period>
+
+            Examples:
+              feat(memory): add lancedb storage backend
+              fix(agents): resolve deadlock in concurrent execution
+              chore(deps): bump pydantic to 2.11.9