docs: update documentation and rename SDK directories

- Rewrite README.md to match current codebase (14 tools, #[non_exhaustive]
  AgentEvent, LlmPlanner, simplified SessionOptions)
- Update lib.rs architecture doc comment
- Rename sdk/node-native → sdk/node, sdk/python-native → sdk/python
- Update Cargo.toml exclude paths and CI workflow paths

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: ZhiXiao-Lin

.github/workflows/publish-node.yml

@@ -62,11 +62,11 @@ jobs:
           version: 0.13.0
 
       - name: Install dependencies
-        working-directory: sdk/node-native
+        working-directory: sdk/node
         run: npm install
 
       - name: Build native module
-        working-directory: sdk/node-native
+        working-directory: sdk/node
         shell: bash
         run: |
           if [ "${{ matrix.settings.zig }}" = "true" ]; then
@@ -79,7 +79,7 @@ jobs:
         uses: actions/upload-artifact@v4
         with:
           name: node-bindings-${{ matrix.settings.target }}
-          path: sdk/node-native/*.node
+          path: sdk/node/*.node
           if-no-files-found: error
 
   publish:
@@ -96,24 +96,24 @@ jobs:
           registry-url: https://registry.npmjs.org
 
       - name: Install dependencies
-        working-directory: sdk/node-native
+        working-directory: sdk/node
         run: npm install
 
       - name: Download all artifacts
         uses: actions/download-artifact@v4
         with:
           pattern: node-bindings-*
-          path: sdk/node-native/artifacts
+          path: sdk/node/artifacts
           merge-multiple: true
 
       - name: Move artifacts
-        working-directory: sdk/node-native
+        working-directory: sdk/node
         run: |
           mv artifacts/*.node . 2>/dev/null || true
           ls -la *.node
 
       - name: Publish to npm
-        working-directory: sdk/node-native
+        working-directory: sdk/node
         env:
           NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
         run: npm publish --access public --ignore-scripts || true

.github/workflows/publish-python.yml

@@ -61,7 +61,7 @@ jobs:
         uses: PyO3/maturin-action@v1
         with:
           target: ${{ matrix.settings.target }}
-          args: --release --out dist --manifest-path sdk/python-native/Cargo.toml -i python3.10 -i python3.11 -i python3.12 -i python3.13
+          args: --release --out dist --manifest-path sdk/python/Cargo.toml -i python3.10 -i python3.11 -i python3.12 -i python3.13
           manylinux: ${{ matrix.settings.manylinux || 'auto' }}
 
       - name: Upload artifact

Cargo.toml

@@ -6,8 +6,8 @@ members = [
 # Native SDK crates require special toolchains (Python/Node.js)
 # Build them individually: cargo build -p a3s-code-node / a3s-code-py
 exclude = [
-    "sdk/node-native",
-    "sdk/python-native",
+    "sdk/node",
+    "sdk/python",
 ]
 
 [profile.release]