Exclude teach-impeccable from suggestions, allow other installed skills

- Filter teach-impeccable from {{available_commands}} (setup skill, not a fix)
- Soften wording: "prefer" our commands but also allow other installed skills
  the LLM is sure exist, preventing false negatives while still preventing
  hallucinated commands

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/lib/utils.js

@@ -326,11 +326,14 @@ function escapeRegex(str) {
   return str.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
 }
 
+const EXCLUDED_FROM_SUGGESTIONS = new Set(['teach-impeccable', 'i-teach-impeccable']);
+
 export function replacePlaceholders(content, provider, commandNames = []) {
   const placeholders = PROVIDER_PLACEHOLDERS[provider] || PROVIDER_PLACEHOLDERS['cursor'];
-  const commandList = commandNames.length > 0
-    ? commandNames.map(n => `/${n}`).join(', ')
-    : '';
+  const commandList = commandNames
+    .filter(n => !EXCLUDED_FROM_SUGGESTIONS.has(n))
+    .map(n => `/${n}`)
+    .join(', ');
 
   return content
     .replace(/\{\{model\}\}/g, placeholders.model)

source/skills/audit/SKILL.md

@@ -71,7 +71,7 @@ For each issue, document:
 - **Impact**: How it affects users
 - **WCAG/Standard**: Which standard it violates (if applicable)
 - **Recommendation**: How to fix it
-- **Suggested command**: Which command to use (ONLY from: {{available_commands}})
+- **Suggested command**: Which command to use (prefer: {{available_commands}} — or other installed skills you're sure exist)
 
 #### Critical Issues
 [Issues that block core functionality or violate WCAG A]
@@ -108,7 +108,7 @@ Create actionable plan:
 
 ### Suggested Commands for Fixes
 
-Map issues to the available commands. **Only suggest commands from this list**: {{available_commands}}. Never invent commands that aren't listed.
+Map issues to available commands. Prefer these: {{available_commands}}. You may also suggest other installed skills you're sure exist, but never invent commands.
 
 Examples:
 - "Use `/normalize` to align with design system (addresses N theming issues)"

source/skills/critique/SKILL.md

@@ -98,7 +98,7 @@ For each issue:
 - **What**: Name the problem clearly
 - **Why it matters**: How this hurts users or undermines goals
 - **Fix**: What to do about it (be concrete)
-- **Command**: Which command to use (ONLY from: {{available_commands}})
+- **Command**: Which command to use (prefer: {{available_commands}} — or other installed skills you're sure exist)
 
 ### Minor Observations
 Quick notes on smaller issues worth addressing.