feat: initial Slack daemon implementation

Full FGP daemon for Slack with:
- Conversations: list, info, history, members
- Chat: post, update, delete messages
- Users: list, info
- Reactions: add, remove, get
- Search: messages, files
- Files: list

Authentication via SLACK_TOKEN env var or --token flag.
CLI with start/stop/status/health commands.

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

Author: wolfiesch

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [master, main]
+  pull_request:
+    branches: [master, main]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+      - uses: Swatinem/rust-cache@v2
+      - run: cargo test --all-features
+
+  clippy:
+    name: Clippy
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: clippy
+      - uses: Swatinem/rust-cache@v2
+      - run: cargo clippy -- -D warnings
+
+  fmt:
+    name: Format
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt
+      - run: cargo fmt --check

.github/workflows/release.yml

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+name: Release
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+env:
+  CARGO_TERM_COLOR: always
+  BINARY_NAME: fgp-slack
+
+jobs:
+  build:
+    name: Build ${{ matrix.target }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - target: x86_64-unknown-linux-gnu
+            os: ubuntu-latest
+            artifact: fgp-slack-linux-x64
+          - target: aarch64-unknown-linux-gnu
+            os: ubuntu-latest
+            artifact: fgp-slack-linux-arm64
+            cross: true
+          - target: x86_64-apple-darwin
+            os: macos-latest
+            artifact: fgp-slack-macos-x64
+          - target: aarch64-apple-darwin
+            os: macos-latest
+            artifact: fgp-slack-macos-arm64
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          targets: ${{ matrix.target }}
+
+      - uses: Swatinem/rust-cache@v2
+        with:
+          key: ${{ matrix.target }}
+
+      - name: Install cross
+        if: matrix.cross
+        run: cargo install cross --git https://github.com/cross-rs/cross
+
+      - name: Build (cross)
+        if: matrix.cross
+        run: cross build --release --target ${{ matrix.target }}
+
+      - name: Build (native)
+        if: ${{ !matrix.cross }}
+        run: cargo build --release --target ${{ matrix.target }}
+
+      - name: Package binary
+        shell: bash
+        run: |
+          cd target/${{ matrix.target }}/release
+          tar czvf ../../../${{ matrix.artifact }}.tar.gz ${{ env.BINARY_NAME }}
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: ${{ matrix.artifact }}
+          path: ${{ matrix.artifact }}.tar.gz
+          if-no-files-found: error
+
+  release:
+    name: Create Release
+    needs: build
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Download all artifacts
+        uses: actions/download-artifact@v4
+        with:
+          path: artifacts
+
+      - name: List artifacts
+        run: find artifacts -type f
+
+      - name: Create Release
+        uses: softprops/action-gh-release@v1
+        with:
+          generate_release_notes: true
+          files: artifacts/**/*.tar.gz
+
+  publish-crates:
+    name: Publish to crates.io
+    needs: release
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: dtolnay/rust-toolchain@stable
+
+      - name: Verify version matches tag
+        run: |
+          VERSION=$(cargo metadata --format-version 1 --no-deps | jq -r '.packages[0].version')
+          TAG=${GITHUB_REF#refs/tags/v}
+          if [ "$VERSION" != "$TAG" ]; then
+            echo "Version mismatch: Cargo.toml has $VERSION but tag is $TAG"
+            exit 1
+          fi
+
+      - name: Publish to crates.io
+        run: cargo publish --token ${{ secrets.CARGO_REGISTRY_TOKEN }}
+        continue-on-error: true

.gitignore

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+/target