fix: validation errors - cross-platform and consistency

1. Cross-platform issue (enhance.md):
   - Replace hardcoded ~/.claude/enhance/suppressions.json
   - Use ${STATE_DIR}/enhance/suppressions.json placeholder
   - Now works across Claude Code, OpenCode, and Codex

2. Consistency validator (validate-repo-consistency.js):
   - Fix regex to handle backticks in skill references
   - Pattern now matches both "MUST execute the skill-name skill"
     and "MUST execute the `skill-name` skill"
   - Resolves 8 false-positive errors for enhance agents

All validation checks now pass:
- npm test: 1400 tests passing
- npm run verify: All tools detected
- npm run validate: All checks passing

Author: avifenesh

plugins/enhance/commands/enhance.md

@@ -137,7 +137,7 @@ Auto-learning enabled by default - detects and saves false positives for future
 - Auto-fixable issues highlighted
 - Fixes applied only with explicit --apply flag
 - Auto-learning detects false positives with 90%+ confidence
-- Learned suppressions stored in cross-platform location (~/.claude/enhance/suppressions.json)
+- Learned suppressions stored in cross-platform location (${STATE_DIR}/enhance/suppressions.json)
 - Zero token waste on previously suppressed findings
 
 ---

scripts/validate-repo-consistency.js

@@ -422,7 +422,7 @@ function validateEnhanceAgentSkillUsage() {
   for (const file of agentFiles) {
     const filePath = path.join(agentsDir, file);
     const content = fs.readFileSync(filePath, 'utf8');
-    const usageMatch = content.match(/MUST execute the ([^\s]+) skill/);
+    const usageMatch = content.match(/MUST execute the `?([^\s`]+)`? skill/);
     if (!usageMatch) {
       errors.push(`enhance agent ${file} must require skill usage with "MUST execute the <skill> skill"`);
       continue;