Add LimitlessX: Rust-powered inline public X reader

.cargo/config.toml

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+[alias]
+xtask = "run -p xtask --"

.github/workflows/check.yml

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+name: Verify and package
+on: [push, pull_request, workflow_dispatch]
+permissions:
+  contents: read
+jobs:
+  verify:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: npm
+      - run: npm ci --ignore-scripts
+      - name: Install pinned Rust and build tools
+        run: |
+          rustup toolchain install 1.99.1 --profile minimal --component clippy,rustfmt --target wasm32-unknown-unknown
+          curl -fsSL https://github.com/wasm-bindgen/wasm-bindgen/releases/download/0.2.129/wasm-bindgen-0.2.129-x86_64-unknown-linux-musl.tar.gz -o /tmp/bindgen.tar.gz
+          tar -xzf /tmp/bindgen.tar.gz -C /tmp
+          echo /tmp/wasm-bindgen-0.2.129-x86_64-unknown-linux-musl >> "$GITHUB_PATH"
+          curl -fsSL https://github.com/WebAssembly/binaryen/releases/download/version_133/binaryen-version_133-x86_64-linux.tar.gz -o /tmp/binaryen.tar.gz
+          tar -xzf /tmp/binaryen.tar.gz -C /tmp
+          echo /tmp/binaryen-version_133/bin >> "$GITHUB_PATH"
+      - name: Rust validation
+        run: |
+          cargo fmt --all -- --check
+          cargo xtask test
+          cargo clippy --workspace --all-targets --locked -- -D warnings
+          cargo clippy --target wasm32-unknown-unknown -p limitless-runtime -p limitless-ui --locked -- -D warnings
+      - name: Build validated browser packages and source archive
+        run: cargo xtask package
+      - name: Install browser harness
+        run: |
+          python3 -m pip install -r tests/browser/requirements.txt
+          python3 -m playwright install --with-deps chromium firefox
+      - name: Chromium extension integration
+        run: |
+          python3 tests/browser/smoke.py
+          python3 tests/browser/inline.py
+          python3 tests/browser/inline_contracts.py
+          python3 tests/browser/native_fidelity.py
+          python3 tests/browser/lifecycle.py
+          python3 tests/browser/infinite_scroll.py
+          python3 tests/browser/identity_recovery.py
+          python3 tests/browser/review_regressions.py
+          python3 tests/browser/media_player.py
+      - name: Firefox extension integration
+        run: |
+          curl -fsSL https://github.com/mozilla/geckodriver/releases/download/v0.37.1/geckodriver-v0.37.1-linux64.tar.gz -o /tmp/geckodriver.tar.gz
+          tar -xzf /tmp/geckodriver.tar.gz -C /tmp
+          export GECKODRIVER=/tmp/geckodriver
+          python3 tests/browser/firefox_smoke.py
+          python3 tests/browser/firefox_inline.py
+      - uses: actions/upload-artifact@v4
+        with:
+          name: limitlessx-development-packages
+          path: dist/releases/*

.gitignore

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+/target/
+/dist/
+.superpowers/
+__pycache__/
+/tests/browser/artifacts/
+
+/node_modules/