Improve Raven highlighting, docs, and CI

.gitattributes

@@ -1,5 +1,5 @@
 * text=auto
-*.rv text eol=lf
+*.rv text eol=lf linguist-language=Rust
 *.c text eol=lf
 *.h text eol=lf
 *.md text eol=lf

.github/workflows/ci.yml

@@ -3,21 +3,32 @@ name: CI
 on:
   push:
     branches: [main]
+    tags: ["v*"]
   pull_request:
     branches: [main]
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
 jobs:
   test:
     strategy:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest]
     runs-on: ${{ matrix.os }}
+    timeout-minutes: 10
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
 
       - name: Install Raven
         uses: martian56/setup-raven@v1
+        with:
+          raven-version: "2.26.1"
 
       - name: Build
         run: rvpm build
@@ -27,3 +38,6 @@ jobs:
 
       - name: Format check
         run: rvpm fmt --check
+
+      - name: Documentation
+        run: rvpm doc

README.md

@@ -1,5 +1,7 @@
 # perch
 
+[![CI](https://github.com/martian56/perch/actions/workflows/ci.yml/badge.svg)](https://github.com/martian56/perch/actions/workflows/ci.yml)
+
 Raw terminal control for Raven. Keypresses as they happen, mouse reports,
 terminal size, and unbuffered writes, on Linux, macOS, and Windows.
 
@@ -23,7 +25,7 @@ the same one Raven already needs for linking.
 
 ## Usage
 
-```raven
+```rust
 import "github.com/martian56/perch" { Terminal }
 import "github.com/martian56/perch/keys" { InputEvent, Key }