Modernize action runtime to Node 24

Node 20 is EOL. This moves the action to Node 24 and
updates every dependency to its current major version:

  @actions/core 1 -> 3, @actions/github 6 -> 9,
  zod 3 -> 4, TypeScript 5 -> 6, Biome 2.2 -> 2.4,
  Bun CI pin 1.3.13 -> 1.3.14.

Zod 4 tightened UUID validation to RFC 4122, which
broke test fixtures using zero-version UUIDs. TypeScript
6 stopped auto-loading ambient types, requiring an
explicit types array in tsconfig. Both fixed inline.

Removed unused @octokit/rest. Migrated deprecated
z.string().uuid()/url()/email() to top-level z.uuid()
etc. Removed dead esModuleInterop (always-on in TS 6).
Bumped target/lib to ES2024 to match Node 24.

dist/index.js is now marked linguist-generated in
.gitattributes so PR diffs and whitespace checks skip
the committed bundle.

Author: mafredri

.gitattributes

@@ -0,0 +1 @@
+dist/index.js linguist-generated -diff -whitespace

.github/workflows/ci.yaml

@@ -14,12 +14,12 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup Bun
-        uses: oven-sh/setup-bun@v1
+        uses: oven-sh/setup-bun@v2
         with:
-          bun-version: 1.3.13
+          bun-version: 1.3.14
 
       - name: Install dependencies
         run: bun install

AGENTS.md

@@ -4,14 +4,15 @@
 
 **Purpose**: GitHub Action that creates and manages Coder Agents chats for GitHub users with automated issue commenting support.
 
-**Key Difference from create-task-action**: This action targets the Coder Agents Chat API (`/api/experimental/chats`) instead of the Tasks API. Agents purposefully does NOT expose template selection — it either auto-provisions a workspace or uses an existing one.
+**Key Difference from create-task-action**: This action targets the Coder Agents Chat API (`/api/experimental/chats`) instead of the Tasks API. Agents purposefully does NOT expose template selection. It either auto-provisions a workspace or uses an existing one.
 
 **Tech Stack**:
-- **Runtime**: Bun (JavaScript/TypeScript runtime & bundler)
+- **Action Runtime**: Node 24
+- **Development Runtime**: Bun (JavaScript/TypeScript runtime & bundler)
 - **Language**: TypeScript with strict mode enabled
 - **Validation**: Zod for runtime schema validation
 - **Testing**: Bun's built-in test runner
-- **GitHub Integration**: @actions/core, @actions/github, @octokit/rest
+- **GitHub Integration**: @actions/core, @actions/github
 - **Formatting/Linting**: Biome
 
 ---

Makefile

@@ -14,7 +14,7 @@ lint:
 	bun run lint
 	bun run typecheck
 
-dist/index.js: $(TS_FILES) package.json node_modules
+dist/index.js: $(TS_FILES) package.json bun.lock node_modules
 	bun run build
 
 build: dist/index.js

action.yaml

@@ -123,5 +123,5 @@ outputs:
     description: "Human-readable error message when the chat fails."
 
 runs:
-  using: "node20"
+  using: "node24"
   main: "dist/index.js"

biome.json

@@ -1,5 +1,5 @@
 {
-	"$schema": "https://biomejs.dev/schemas/2.2.4/schema.json",
+	"$schema": "https://biomejs.dev/schemas/2.4.15/schema.json",
 	"files": {
 		"includes": ["src/**/*.ts", "src/**/*.js", "*.json", "*.md"],
 		"maxSize": 2097152