feat: add video skill for AI video production (#258)

* feat: add video skill for AI video production

New skill covering programmatic video (Remotion, Hyperframes), AI video
generation (Veo, Runway, Kling), AI avatars (HeyGen, Synthesia), and
editing/repurposing workflows. Includes AI video prompting reference.

New tool integrations: HeyGen (MCP-enabled), Hyperframes (open source).
Updated tools registry with Video category expansion.

Total skills: 39

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

* fix: apply accuracy fixes from Codex review

- Hyperframes: Node.js requirement 18+ → 22+ (confirmed via npm)
- Veo 3: soften 4K claim to "Up to 1080p (4K varies)"
- Sora: replace shutdown claim with availability caveat
- HeyGen: remove dollar amounts, link to pricing page
- Remotion: soften license wording

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

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

README.md

@@ -35,7 +35,7 @@ Skills reference each other and build on shared context. The `product-marketing-
 │site-arch │ │onboard   │ │cold-email│ │ab-test     │ │churn-    │ │launch       │ │customer-  │
 │programm  │ │form-cro  │ │email-seq │ │analytics   │ │ prevent  │ │pricing      │ │ research  │
 │schema    │ │popup-cro │ │social    │ │            │ │community │ │comp-alts    │ │           │
-│content   │ │paywall   │ │          │ │            │ │lead-magnt│ │comp-profile │ │           │
+│content   │ │paywall   │ │video     │ │            │ │lead-magnt│ │comp-profile │ │           │
 │aso-audit │ │          │ │          │ │            │ │          │ │directory    │ │           │
 └────┬─────┘ └────┬─────┘ └────┬─────┘ └─────┬──────┘ └────┬─────┘ └──────┬──────┘ └─────┬─────┘
      │            │            │              │             │              │              │
@@ -93,6 +93,7 @@ See each skill's **Related Skills** section for the full dependency map.
 | [signup-flow-cro](skills/signup-flow-cro/) | When the user wants to optimize signup, registration, account creation, or trial activation flows. Also use when the... |
 | [site-architecture](skills/site-architecture/) | When the user wants to plan, map, or restructure their website's page hierarchy, navigation, URL structure, or internal... |
 | [social-content](skills/social-content/) | When the user wants help creating, scheduling, or optimizing social media content for LinkedIn, Twitter/X, Instagram,... |
+| [video](skills/video/) | When the user wants to create, generate, or produce video content using AI tools or programmatic frameworks. Covers Remotion, Hyperframes, HeyGen, Veo, Runway, Kling... |
 <!-- SKILLS:END -->
 
 ## Installation