chore(agents): generate Cursor rules from .claude/rules and symlink AGENTS.md

- .claude/rules/<name>.md is now the single source for editor rules; the
  sync script projects .cursor/rules/<name>.mdc from it (description +
  globs, or alwaysApply when a rule has no paths). The Cursor copies had
  drifted since July and five newer rules never reached Cursor
- Move the Cursor-only testing rule to .claude/rules/sim-testing.md and add
  a description to every canonical rule
- Pre-commit regenerates on staged rule edits; check:skills verifies
- AGENTS.md becomes a symlink to CLAUDE.md; it was a stale subset

Author: waleedlatif1

.claude/rules/constitution.md

@@ -1,3 +1,7 @@
+---
+description: Sim product language, positioning, and tone guidelines
+---
+
 # Sim — Language & Positioning
 
 When editing user-facing copy (landing pages, docs, metadata, marketing), follow these rules.

.claude/rules/emcn-components.md

@@ -1,4 +1,5 @@
 ---
+description: EMCN component library patterns
 paths:
   - "packages/emcn/**"
 ---

.claude/rules/global.md

@@ -1,3 +1,7 @@
+---
+description: Global coding standards that apply to all files
+---
+
 # Global Standards
 
 ## Logging

.claude/rules/landing-seo-geo.md

@@ -1,4 +1,5 @@
 ---
+description: SEO and GEO guidelines for the landing page
 paths:
   - "apps/sim/app/(landing)/**/*.tsx"
   - "apps/sim/content/**/*.mdx"

.claude/rules/sim-architecture.md

@@ -1,4 +1,5 @@
 ---
+description: Core architecture principles for the Sim app
 paths:
   - "apps/sim/**"
 ---

.claude/rules/sim-caching.md

@@ -1,4 +1,5 @@
 ---
+description: In-process caching rules: lru-cache with a ceiling, never hand-rolled TTL maps
 paths:
   - "apps/sim/lib/**/*.ts"
   - "apps/sim/providers/**/*.ts"

.claude/rules/sim-components.md

@@ -1,4 +1,5 @@
 ---
+description: Component patterns and structure for React components
 paths:
   - "apps/sim/**/*.tsx"
 ---

.claude/rules/sim-hooks.md

@@ -1,4 +1,5 @@
 ---
+description: Custom hook patterns and best practices
 paths:
   - "apps/sim/**/use-*.ts"
   - "apps/sim/**/hooks/**/*.ts"

.claude/rules/sim-imports.md

@@ -1,4 +1,5 @@
 ---
+description: Import patterns for the Sim application
 paths:
   - "apps/sim/**/*.ts"
   - "apps/sim/**/*.tsx"

.claude/rules/sim-integrations.md

@@ -1,4 +1,5 @@
 ---
+description: Adding new integrations (tools, blocks, triggers)
 paths:
   - "apps/sim/tools/**"
   - "apps/sim/blocks/**"