docs: refresh README/docs/examples + install scripts for waves 1-4

User-facing documentation drifted behind several waves of feature work
(plugin manifest, hooks, sync command, --weekly, audit skills, Karpathy
skill, CLAUDE.local.md tier, layered hook config). Refresh + fix one
real install bug. Surgical edits only — no rewrites.

README.md:
  - "What's New" block now reflects the plugin manifest, --weekly,
    InstructionsLoaded hook, AGENTS.md interop, CLAUDE.local.md tier,
    layered hook config, and the fail-closed guardian.
  - "What's Included" expanded from 5 numbered bullets to a structured
    list grouping the 5 skills (incl. three forked audit skills),
    2 slash commands, 1 agent, and 3 hook scripts.
  - Components Deep Dive: /sync-claude-md and the guardian's fail-closed
    contract now documented.
  - Project Status: 1.0.0 -> 2.1.0; Quick Stats updated to reflect
    actual component counts.
  - Acknowledgments: attribution to MIT-licensed forrestchang and
    shanraisshan source repos for adapted patterns.

docs/ARCHITECTURE.md, docs/QUICK_START.md, docs/TROUBLESHOOTING.md,
docs/INSTALLATION.md, examples/modular-setup.md, examples/integration-
examples.md:
  - Every "20-300 lines" / ">300 lines" / "exceeds 300 lines" reference
    rewritten to the actual 150-line hard cap.
  - Every ls/Remove-Item path that pointed at the legacy
    ~/.claude/commands/enhance-claude-md/ bundle now points at the
    top-level enhance-claude-md.md + sync-claude-md.md files.
  - integration-examples.md line-bounds shell guard now uses 20..150.

docs/CLAUDE.md:
  - Install-verify ls list extended with the three new audit-skill
    directories so docs match what install.sh actually creates.

install.sh + install.ps1 (REAL FIX, not just docs):
  - The three forked audit skills (claude-md-drift-audit, link-check,
    dependency-rescan) were registered in plugin.json but never copied
    by the direct-install path. Both installers now iterate over them
    after the karpathy-guidelines block, mirroring the same backup +
    nested-duplicate-cleanup pattern. Banner section and uninstall
    instructions list all 5 skills.

Verified:
  - All 5 CLAUDE.md files in this repo still <= 150 lines after edits.
  - install.sh passes bash -n syntax check.
  - Plugin manifest still resolves all 8 referenced paths on disk.
  - README invariants present: 2.1.0, --weekly, hooks/hooks.json,
    both source-repo attributions, three audit skill names.
  - Stale-claim sweep: zero "20-300" / ">300" / "exceeds 300" refs
    remain in docs/ or examples/.

install.ps1

@@ -178,6 +178,9 @@ Write-Host ""
 Write-Info "Installation will create:"
 Write-Host "  • Skill:    $skillsDir\claudeforge-skill\"
 Write-Host "  • Skill:    $skillsDir\karpathy-guidelines\"
+Write-Host "  • Skill:    $skillsDir\claude-md-drift-audit\"
+Write-Host "  • Skill:    $skillsDir\claude-md-link-check\"
+Write-Host "  • Skill:    $skillsDir\claude-md-dependency-rescan\"
 Write-Host "  • Command:  $commandsDir\enhance-claude-md.md"
 Write-Host "  • Command:  $commandsDir\sync-claude-md.md"
 Write-Host "  • Agent:    $agentsDir\claude-md-guardian.md"
@@ -232,6 +235,25 @@ if (Test-Path $nestedKarpathy) {
 }
 Write-Success "Karpathy guidelines installed → $karpathyPath\"
 
+# Install the forked task-style audit skills as separate top-level skills
+# so each is invocable standalone and discoverable by /sync-claude-md --weekly.
+$auditSkills = @("claude-md-drift-audit", "claude-md-link-check", "claude-md-dependency-rescan")
+foreach ($auditSkill in $auditSkills) {
+    Write-Info "Installing $auditSkill skill..."
+    $auditTarget = "$skillsDir\$auditSkill"
+    if (Test-Path $auditTarget) {
+        Write-Warning "Existing $auditSkill skill found. Creating backup..."
+        $backupName = "$auditSkill.backup.$(Get-Date -Format 'yyyyMMdd_HHmmss')"
+        Move-Item -Path $auditTarget -Destination "$skillsDir\$backupName" -Force
+    }
+    Copy-Item -Path "skill\$auditSkill" -Destination $auditTarget -Recurse -Force
+    $nestedAudit = "$skillPath\$auditSkill"
+    if (Test-Path $nestedAudit) {
+        Remove-Item -Path $nestedAudit -Recurse -Force
+    }
+    Write-Success "$auditSkill installed → $auditTarget\"
+}
+
 # Install slash commands. Each .md file in command/ becomes its own
 # top-level command file so it registers as /<name>. README.md is skipped.
 Write-Info "Installing slash commands..."
@@ -376,12 +398,18 @@ Write-Host ""
 if ($scope -eq "user-level") {
     Write-Host "  Remove-Item -Recurse -Force ~\.claude\skills\claudeforge-skill"
     Write-Host "  Remove-Item -Recurse -Force ~\.claude\skills\karpathy-guidelines"
+    Write-Host "  Remove-Item -Recurse -Force ~\.claude\skills\claude-md-drift-audit"
+    Write-Host "  Remove-Item -Recurse -Force ~\.claude\skills\claude-md-link-check"
+    Write-Host "  Remove-Item -Recurse -Force ~\.claude\skills\claude-md-dependency-rescan"
     Write-Host "  Remove-Item -Force ~\.claude\commands\enhance-claude-md.md"
     Write-Host "  Remove-Item -Force ~\.claude\commands\sync-claude-md.md"
     Write-Host "  Remove-Item -Force ~\.claude\agents\claude-md-guardian.md"
 } else {
     Write-Host "  Remove-Item -Recurse -Force .\.claude\skills\claudeforge-skill"
     Write-Host "  Remove-Item -Recurse -Force .\.claude\skills\karpathy-guidelines"
+    Write-Host "  Remove-Item -Recurse -Force .\.claude\skills\claude-md-drift-audit"
+    Write-Host "  Remove-Item -Recurse -Force .\.claude\skills\claude-md-link-check"
+    Write-Host "  Remove-Item -Recurse -Force .\.claude\skills\claude-md-dependency-rescan"
     Write-Host "  Remove-Item -Force .\.claude\commands\enhance-claude-md.md"
     Write-Host "  Remove-Item -Force .\.claude\commands\sync-claude-md.md"
     Write-Host "  Remove-Item -Force .\.claude\agents\claude-md-guardian.md"