Add release workflow and update install instructions

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: alexylon

.github/workflows/release.yml

@@ -0,0 +1,71 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - "v*"
+
+permissions:
+  contents: write
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        include:
+          - target: x86_64-unknown-linux-gnu
+            os: ubuntu-latest
+          - target: x86_64-apple-darwin
+            os: macos-latest
+          - target: aarch64-apple-darwin
+            os: macos-latest
+          - target: x86_64-pc-windows-msvc
+            os: windows-latest
+
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Rust toolchain
+        run: rustup target add ${{ matrix.target }}
+
+      - name: Build
+        run: cargo build --release --target ${{ matrix.target }}
+
+      - name: Package (unix)
+        if: runner.os != 'Windows'
+        run: |
+          tar czf sofos-${{ matrix.target }}.tar.gz -C target/${{ matrix.target }}/release sofos
+          zip -j sofos-${{ matrix.target }}.zip target/${{ matrix.target }}/release/sofos
+
+      - name: Package (windows)
+        if: runner.os == 'Windows'
+        shell: bash
+        run: 7z a sofos-${{ matrix.target }}.zip ./target/${{ matrix.target }}/release/sofos.exe
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: sofos-${{ matrix.target }}
+          path: sofos-${{ matrix.target }}.*
+
+  release:
+    needs: build
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/download-artifact@v4
+        with:
+          merge-multiple: true
+
+      - name: Create GitHub Release
+        uses: softprops/action-gh-release@v2
+        with:
+          generate_release_notes: true
+          files: |
+            sofos-*.tar.gz
+            sofos-*.zip

README.md

@@ -64,7 +64,14 @@ Tested on macOS but should work on Linux and Windows as well.
 **Install:**
 
 ```bash
-# Homebrew (could be behind `cargo install`)
+# Prebuilt binary — download from GitHub Releases:
+# https://github.com/alexylon/sofos-code/releases/latest
+
+# macOS / Linux
+tar xzf sofos-*.tar.gz
+sudo mv sofos /usr/local/bin/
+
+# Homebrew
 brew tap alexylon/tap && brew install sofos
 
 # Cargo (requires Rust 1.70+)
@@ -75,6 +82,8 @@ git clone https://github.com/alexylon/sofos-code.git
 cd sofos-code && cargo install --path .
 ```
 
+> **macOS:** On first run, macOS may block the binary. Go to System Settings → Privacy & Security and click *Allow Anyway*.
+
 **Important:** Add `.sofos/` to `.gitignore` (contains session history and personal settings). Keep `AGENTS.md` (team-wide instructions).
 
 ## Usage