Add frontend prefs, rebase review, and PR update guidance for AI

.github/copilot-instructions.md

@@ -1,5 +1,12 @@
 # This project is a Ruby on Rails application.
 
+# Frontend requirements:
+- Always use Stimulus for JavaScript behavior — do not write raw/inline JS or jQuery
+- Always use Tailwind CSS utility classes for styling — do not write custom CSS unless absolutely necessary
+- Prefer Turbo for navigation and form submissions before reaching for Stimulus
+- ES6+ syntax, ESM imports/exports
+- Stimulus controller naming: `[name]_controller.js`
+
 # Code style requirements:
 - Use modern Ruby syntax
 - Prefer early returns and guard clauses
@@ -50,3 +57,9 @@ This project uses rubocop-rails-omakase. All code MUST follow these rules:
 - Use `Foo.method` not `Foo::method` for method calls
 - No parentheses around conditions: `if foo` not `if (foo)`
 - No semicolons to separate statements
+
+# PRs
+- On every push, update the PR title and description to reflect the current diff
+
+# Git
+- When rebasing onto main, review incoming changes for their intent and flag any oversights — missing tests, incomplete migrations, broken assumptions, or conflicts between the two branches. Check both directions: schema/model changes on either branch that affect views, partials, or layouts on the other (e.g., main redesigned a table's CSS but your branch adds new columns to it, or vice versa)

AGENTS.md

@@ -208,6 +208,12 @@ end
 
 ## Frontend
 
+### Preferences
+
+- **Always use Stimulus** for JavaScript behavior — do not write raw/inline JS or jQuery
+- **Always use Tailwind CSS** utility classes for styling — do not write custom CSS unless absolutely necessary
+- Prefer Turbo for navigation and form submissions before reaching for Stimulus
+
 ### Stimulus Controllers (32)
 
 Key controllers:
@@ -313,6 +319,14 @@ RuboCop linting on PRs and pushes to main.
 | Positioning | Positioning gem for ordered records |
 | API | JWT tokens, Apipie docs, Rack CORS |
 
+## PRs
+
+- On every push, update the PR title and description to reflect the current diff
+
+## Git
+
+- When rebasing onto main, review incoming changes for their intent and flag any oversights — missing tests, incomplete migrations, broken assumptions, or conflicts between the two branches. Check both directions: schema/model changes on either branch that affect views, partials, or layouts on the other (e.g., main redesigned a table's CSS but your branch adds new columns to it, or vice versa)
+
 ## Rake Tasks
 
 Located in `lib/tasks/` (~17 files). Notable:

CLAUDE.md

@@ -149,10 +149,11 @@ bundle exec bundle-audit check --update
 ## JavaScript
 
 - ES6+ syntax, ESM imports/exports
-- Prefer Stimulus + Turbo for new interactive features
+- **Always use Stimulus** for JavaScript behavior — do not write raw/inline JS or jQuery
+- **Always use Tailwind CSS** utility classes for styling — do not write custom CSS unless absolutely necessary
+- Prefer Turbo for navigation and form submissions before reaching for Stimulus
 - Controller naming: `[name]_controller.js`
 - Keep controllers focused and small
-- Use Tailwind CSS v4 utility classes
 
 ## Migrations
 
@@ -164,13 +165,15 @@ bundle exec bundle-audit check --update
 - Default branch is `main`
 - Commit messages should explain why, not what
 - CI runs via GitHub Actions (`.github/workflows/`)
+- **When rebasing onto main**, review incoming changes for their intent and flag any oversights — missing tests, incomplete migrations, broken assumptions, or conflicts between the two branches. Check both directions: schema/model changes on either branch that affect views, partials, or layouts on the other (e.g., main redesigned a table's CSS but your branch adds new columns to it, or vice versa)
 
 ## PRs
 
 - Use `docs/pull_request_template.md` for PR description structure
 - Use bullet points, not paragraphs, when filling out each section
 - Description must explain why the change was made, not just what
 - Include screenshots for UI changes
+- **On every push**, update the PR title and description to reflect the current diff
 
 ## Quick Commands