Consolidate 18 skills into 1 /impeccable skill with 20 commands

Biggest change in a while. Users previously had 18 standalone skill
entries cluttering their /menu; now they have one entry (/impeccable)
that routes to 20 specialized commands via argument dispatch. The pin
mechanism (/impeccable pin audit) restores standalone shortcuts on
demand for commands users hit all the time.

## Architecture

- Single /impeccable skill with command router section in SKILL.md
- 20 commands served via reference files under source/skills/impeccable/reference/
- /impeccable pin <command> creates a lightweight redirect shim so users
  who prefer /audit, /polish, etc. can still have them
- Context gathering (teach) auto-runs on first use
- command-metadata.json is the single source of truth for command
  descriptions, argument hints, and relationships

## Site rewrite

- Docs URL: /skills renamed to /docs (with /skills permanent redirects)
- Homepage hero frames Impeccable as "one skill with 20 commands"
- "Get Started" split into 50/50 install + how-to-use with editorial
  numbered steps, /impeccable shown as the home command with three modes
- New /docs overview: home command hero card + dense category rows
  matching the old cheatsheet density, with leads-to/pairs-with/
  combines-with relationship metadata served from a shared source
- Cheatsheet merged into /docs, /cheatsheet redirects
- Magazine spread and mobile cards show /impeccable as a stacked
  namespace label above the command name at full display size
- Periodic table updated with craft/teach/extract as first-class cells
- Skill detail pages generate from reference files, with an editorial
  wrapper per command for tagline + body
- Tutorials and anti-patterns pages updated to use /impeccable <cmd>

## Build system

- Dead code removed (scripts/lib/transformers/shared.js)
- Build log wording fixed ("1 skill" not "1 skills (1 user-invocable)")
- generateApiData fallback branch removed (throws loudly if metadata
  missing instead of silently degrading)
- Commands API includes editorial tagline alongside the long description;
  UI surfaces prefer tagline for human display, description for auto-
  trigger keyword matching

## Gitignore

- Added .claude/scheduled_tasks.lock, .claude/settings.local.json to
  ignore list (local Claude Code state that should not be tracked).
- Harness skill directories (.claude/skills/, .agents/skills/, etc.)
  remain tracked by design: npx skills reads them from this repo at
  install time and they enable clean submodule use.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/cleanup-deprecated.test.mjs

@@ -77,7 +77,7 @@ describe('cleanup-deprecated', () => {
       assert.ok(names.includes('i-arrange'));
       assert.ok(names.includes('frontend-design'));
       assert.ok(names.includes('i-frontend-design'));
-      assert.equal(names.length, 12); // 6 deprecated * 2
+      assert.equal(names.length, 46); // 23 deprecated * 2
     });
   });
 
@@ -128,11 +128,11 @@ describe('cleanup-deprecated', () => {
     });
 
     it('leaves non-deprecated skills alone', () => {
-      writeSkill(tmp, '.claude', 'polish', 'Invoke /impeccable first.');
+      writeSkill(tmp, '.claude', 'my-custom-skill', 'Invoke /impeccable first.');
       writeSkill(tmp, '.claude', 'arrange', 'Invoke /impeccable first.');
       const deleted = removeDeprecatedSkills(tmp);
       assert.equal(deleted.length, 1); // only arrange
-      assert.equal(existsSync(join(tmp, '.claude', 'skills', 'polish')), true);
+      assert.equal(existsSync(join(tmp, '.claude', 'skills', 'my-custom-skill')), true);
     });
 
     it('handles symlinks to deprecated skills', () => {
@@ -152,7 +152,7 @@ describe('cleanup-deprecated', () => {
         version: 1,
         skills: {
           arrange: { source: 'pbakaus/impeccable', sourceType: 'github', computedHash: 'abc' },
-          polish: { source: 'pbakaus/impeccable', sourceType: 'github', computedHash: 'def' },
+          impeccable: { source: 'pbakaus/impeccable', sourceType: 'github', computedHash: 'def' },
           'resolve-reviews': { source: 'pbakaus/agent-reviews', sourceType: 'github', computedHash: 'ghi' },
         },
       };
@@ -161,7 +161,7 @@ describe('cleanup-deprecated', () => {
       assert.deepEqual(removed, ['arrange']);
       const updated = JSON.parse(readFileSync(join(tmp, 'skills-lock.json'), 'utf-8'));
       assert.equal(updated.skills.arrange, undefined);
-      assert.ok(updated.skills.polish); // not deprecated
+      assert.ok(updated.skills.impeccable); // not deprecated
       assert.ok(updated.skills['resolve-reviews']); // different source
     });
 
@@ -209,7 +209,7 @@ describe('cleanup-deprecated', () => {
         skills: {
           arrange: { source: 'pbakaus/impeccable', sourceType: 'github', computedHash: 'a' },
           extract: { source: 'pbakaus/impeccable', sourceType: 'github', computedHash: 'b' },
-          polish: { source: 'pbakaus/impeccable', sourceType: 'github', computedHash: 'c' },
+          impeccable: { source: 'pbakaus/impeccable', sourceType: 'github', computedHash: 'c' },
         },
       };
       writeFileSync(join(tmp, 'skills-lock.json'), JSON.stringify(lock), 'utf-8');
@@ -221,13 +221,13 @@ describe('cleanup-deprecated', () => {
       assert.equal(existsSync(join(tmp, '.agents', 'skills', 'arrange')), false);
 
       const updated = JSON.parse(readFileSync(join(tmp, 'skills-lock.json'), 'utf-8'));
-      assert.ok(updated.skills.polish);
+      assert.ok(updated.skills.impeccable); // not deprecated
       assert.equal(updated.skills.arrange, undefined);
       assert.equal(updated.skills.extract, undefined);
     });
 
     it('is a no-op when nothing needs cleaning', () => {
-      writeSkill(tmp, '.claude', 'polish', 'Invoke /impeccable.');
+      writeSkill(tmp, '.claude', 'my-custom-skill', 'Invoke /impeccable.');
       const result = cleanup(tmp);
       assert.equal(result.deletedPaths.length, 0);
       assert.equal(result.removedLockEntries.length, 0);