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>

skills-lock.json

@@ -11,11 +11,6 @@
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     },
-    "arrange": {
-      "source": "pbakaus/impeccable",
-      "sourceType": "github",
-      "computedHash": "698fb952e9ef0d2551a5c3421ef61e084934420e0d8371a02efb4f76f21049e8"
-    },
     "audit": {
       "source": "pbakaus/impeccable",
       "sourceType": "github",
@@ -51,31 +46,11 @@
       "sourceType": "github",
       "computedHash": "ce6fbd844488a326208c1302c73b2865fa4fb20e447b6a06c038315444d6e0c5"
     },
-    "extract": {
-      "source": "pbakaus/impeccable",
-      "sourceType": "github",
-      "computedHash": "1bbe30b5be73a86971f6bccb37daae84aaafceaa6d23429d6a3a0442378ac4ec"
-    },
-    "frontend-design": {
-      "source": "pbakaus/impeccable",
-      "sourceType": "github",
-      "computedHash": "9ebe6c652743fcde8d2ae773f34b6f548dcc8b2e75a3a30936adcd8b95dd2d16"
-    },
     "harden": {
       "source": "pbakaus/impeccable",
       "sourceType": "github",
       "computedHash": "f8ce420b3c78b90707704122264da76514c793ac0e12fb9540ace68d257c231c"
     },
-    "normalize": {
-      "source": "pbakaus/impeccable",
-      "sourceType": "github",
-      "computedHash": "281b7f9e590e252a6aec3f5f83c5ca548c91e8bccb3fd6eee4cc7d5be0becb4d"
-    },
-    "onboard": {
-      "source": "pbakaus/impeccable",
-      "sourceType": "github",
-      "computedHash": "1cbedf70f906150b1b8bb70b61393eaf67e2e1311e1b5e43bde3e47411bcaa2b"
-    },
     "optimize": {
       "source": "pbakaus/impeccable",
       "sourceType": "github",
@@ -96,11 +71,6 @@
       "sourceType": "github",
       "computedHash": "6066e73875e4770e624641355cc04662ce75d2b1d1a3673e24dcbd0ec8936297"
     },
-    "teach-impeccable": {
-      "source": "pbakaus/impeccable",
-      "sourceType": "github",
-      "computedHash": "b3b5541bb9b0a260af793c7d79c2db4a436c2cd9384be34a4024c7f28af72e62"
-    },
     "typeset": {
       "source": "pbakaus/impeccable",
       "sourceType": "github",