build: add workspace rule for antigravity

Antigravity does not support AGENTS.md, instead it has "workspace rules" (antigravity.google/docs/rules-workflows). This commit adds a symlink for the workspace rule.

Author: mmalerba

.agent/rules/agents.md

@@ -0,0 +1 @@
+../../AGENTS.md

.prettierignore

@@ -35,5 +35,8 @@ adev/src/content/aria/**/*.json
 adev/src/content/cli/**/*.json
 adev/src/content/cdk/**/*.json
 
+# Antigravity rules
+.agent/rules/agents.md
+
 CHANGELOG.md
-CHANGELOG_ARCHIVE.md
+CHANGELOG_ARCHIVE.md

AGENTS.md

@@ -1,9 +1,13 @@
+---
+trigger: always_on
+---
+
 This is the source code for the Angular framework. This guide outlines standard practices for AI agents working in this repository.
 
 ## Environment
 
 - Use `pnpm` for package management.
-- Use `pnpm bazel test //target` to run tests. Do not use `ng test`, or just `bazel`
+- Use `pnpm bazel test //target` to run tests.
 
 ## Key Documentation
 
@@ -14,4 +18,3 @@ This is the source code for the Angular framework. This guide outlines standard
 ## Pull Requests
 
 - Use the `gh` CLI (GitHub CLI) for creating and managing pull requests.
-- Avoid using browser tools for PR operations when possible to maintain workflow efficiency.