feat(skills): declare platforms frontmatter for all 79 undeclared built-in skills

Completes the Windows-gating coverage for the built-in skills/ tree. Every
bundled SKILL.md now carries an explicit platforms: declaration so the
loader (agent.skill_utils.skill_matches_platform) can skip-load skills
that don't fit the current OS.

74 skills declared cross-platform (platforms: [linux, macos, windows]):
  Creative (16): ascii-art, ascii-video, architecture-diagram, baoyu-comic,
    baoyu-infographic, claude-design, creative-ideation, design-md,
    excalidraw, humanizer, manim-video, p5js, pixel-art,
    popular-web-designs, pretext, sketch, songwriting-and-ai-music,
    touchdesigner-mcp
  Autonomous agents: claude-code, codex, hermes-agent, opencode
  Data/devops: jupyter-live-kernel, kanban-orchestrator, kanban-worker,
    webhook-subscriptions, dogfood, codebase-inspection
  GitHub: github-auth, github-code-review, github-issues,
    github-pr-workflow, github-repo-management
  Media: gif-search, heartmula, songsee, spotify, youtube-content
  MCP / email / gaming / notes / smart-home: native-mcp, himalaya,
    pokemon-player, obsidian, openhue
  mlops (non-broken): weights-and-biases, huggingface-hub, llama-cpp,
    outlines, segment-anything-model, dspy, trl-fine-tuning
  Productivity: airtable, google-workspace, linear, maps, nano-pdf,
    notion, ocr-and-documents, powerpoint
  Red-teaming / research: godmode, arxiv, blogwatcher, llm-wiki,
    polymarket
  Software-dev: debugging-hermes-tui-commands, hermes-agent-skill-authoring,
    node-inspect-debugger, plan, requesting-code-review, spike,
    subagent-driven-development, systematic-debugging,
    test-driven-development, writing-plans
  Misc: yuanbao

5 skills gated from Windows (platforms: [linux, macos]):
  mlops/inference/vllm (serving-llms-vllm)
    vLLM is officially Linux-only; Windows requires WSL.
  mlops/training/axolotl
    Axolotl's flash-attn + deepspeed + bitsandbytes stack is Linux-first.
  mlops/training/unsloth
    Requires Triton + xformers + flash-attn — Linux only in practice.
  mlops/models/audiocraft (audiocraft-audio-generation)
    torchaudio ffmpeg backend + encodec dependencies are Linux-first.
  mlops/inference/obliteratus
    Research abliteration workflow; relies on Linux-focused pytorch
    kernels and MLX — no first-class Windows path.

Same strict-over-lenient policy as the optional-skills sweep: when the
underlying tool's Windows support is rough, missing, or WSL-only, gate the
skill. Easier to un-gate after verified Windows support lands than to leak
partial support that manifests as mid-task failures.

Combined with prior commits in this branch, every bundled SKILL.md
(skills/ + optional-skills/) now has a platforms: declaration.

skills/creative/architecture-diagram/SKILL.md

@@ -5,6 +5,7 @@ version: 1.0.0
 author: Cocoon AI (hello@cocoon-ai.com), ported by Hermes Agent
 license: MIT
 dependencies: []
+platforms: [linux, macos, windows]
 metadata:
   hermes:
     tags: [architecture, diagrams, SVG, HTML, visualization, infrastructure, cloud]

skills/creative/ascii-art/SKILL.md

@@ -5,6 +5,7 @@ version: 4.0.0
 author: 0xbyt4, Hermes Agent
 license: MIT
 dependencies: []
+platforms: [linux, macos, windows]
 metadata:
   hermes:
     tags: [ASCII, Art, Banners, Creative, Unicode, Text-Art, pyfiglet, figlet, cowsay, boxes]

skills/creative/ascii-video/SKILL.md

@@ -1,6 +1,7 @@
 ---
 name: ascii-video
 description: "ASCII video: convert video/audio to colored ASCII MP4/GIF."
+platforms: [linux, macos, windows]
 ---
 
 # ASCII Video Production Pipeline

skills/creative/baoyu-comic/SKILL.md

@@ -4,6 +4,7 @@ description: "Knowledge comics (知识漫画): educational, biography, tutorial.
 version: 1.56.1
 author: 宝玉 (JimLiu)
 license: MIT
+platforms: [linux, macos, windows]
 metadata:
   hermes:
     tags: [comic, knowledge-comic, creative, image-generation]

skills/creative/baoyu-infographic/SKILL.md

@@ -4,6 +4,7 @@ description: "Infographics: 21 layouts x 21 styles (信息图, 可视化)."
 version: 1.56.1
 author: 宝玉 (JimLiu)
 license: MIT
+platforms: [linux, macos, windows]
 metadata:
   hermes:
     tags: [infographic, visual-summary, creative, image-generation]

skills/creative/claude-design/SKILL.md

@@ -4,6 +4,7 @@ description: Design one-off HTML artifacts (landing, deck, prototype).
 version: 1.0.0
 author: BadTechBandit
 license: MIT
+platforms: [linux, macos, windows]
 metadata:
   hermes:
     tags: [design, html, prototype, ux, ui, creative, artifact, deck, motion, design-system]

skills/creative/creative-ideation/SKILL.md

@@ -5,6 +5,7 @@ description: "Generate project ideas via creative constraints."
 version: 1.0.0
 author: SHL0MS
 license: MIT
+platforms: [linux, macos, windows]
 metadata:
   hermes:
     tags: [Creative, Ideation, Projects, Brainstorming, Inspiration]

skills/creative/design-md/SKILL.md

@@ -4,6 +4,7 @@ description: Author/validate/export Google's DESIGN.md token spec files.
 version: 1.0.0
 author: Hermes Agent
 license: MIT
+platforms: [linux, macos, windows]
 metadata:
   hermes:
     tags: [design, design-system, tokens, ui, accessibility, wcag, tailwind, dtcg, google]

skills/creative/excalidraw/SKILL.md

@@ -5,6 +5,7 @@ version: 1.0.0
 author: Hermes Agent
 license: MIT
 dependencies: []
+platforms: [linux, macos, windows]
 metadata:
   hermes:
     tags: [Excalidraw, Diagrams, Flowcharts, Architecture, Visualization, JSON]

skills/creative/humanizer/SKILL.md

@@ -4,6 +4,7 @@ description: "Humanize text: strip AI-isms and add real voice."
 version: 2.5.1
 author: Siqi Chen (@blader, https://github.com/blader/humanizer), ported by Hermes Agent
 license: MIT
+platforms: [linux, macos, windows]
 metadata:
   hermes:
     tags: [writing, editing, humanize, anti-ai-slop, voice, prose, text]

skills/creative/manim-video/SKILL.md

@@ -2,6 +2,7 @@
 name: manim-video
 description: "Manim CE animations: 3Blue1Brown math/algo videos."
 version: 1.0.0
+platforms: [linux, macos, windows]
 ---
 
 # Manim Video Production Pipeline

skills/creative/p5js/SKILL.md

@@ -2,6 +2,7 @@
 name: p5js
 description: "p5.js sketches: gen art, shaders, interactive, 3D."
 version: 1.0.0
+platforms: [linux, macos, windows]
 metadata:
   hermes:
     tags: [creative-coding, generative-art, p5js, canvas, interactive, visualization, webgl, shaders, animation]

skills/creative/pixel-art/SKILL.md

@@ -4,6 +4,7 @@ description: "Pixel art w/ era palettes (NES, Game Boy, PICO-8)."
 version: 2.0.0
 author: dodo-reach
 license: MIT
+platforms: [linux, macos, windows]
 metadata:
   hermes:
     tags: [creative, pixel-art, arcade, snes, nes, gameboy, retro, image, video]

skills/creative/popular-web-designs/SKILL.md

@@ -5,6 +5,7 @@ version: 1.0.0
 author: Hermes Agent + Teknium (design systems sourced from VoltAgent/awesome-design-md)
 license: MIT
 tags: [design, css, html, ui, web-development, design-systems, templates]
+platforms: [linux, macos, windows]
 triggers:
   - build a page that looks like
   - make it look like stripe

skills/creative/pretext/SKILL.md

@@ -4,6 +4,7 @@ description: "Use when building creative browser demos with @chenglou/pretext
 version: 1.0.0
 author: Hermes Agent
 license: MIT
+platforms: [linux, macos, windows]
 metadata:
   hermes:
     tags: [creative-coding, typography, pretext, ascii-art, canvas, generative, text-layout, kinetic-typography]

skills/creative/sketch/SKILL.md

@@ -4,6 +4,7 @@ description: "Throwaway HTML mockups: 2-3 design variants to compare."
 version: 1.0.0
 author: Hermes Agent (adapted from gsd-build/get-shit-done)
 license: MIT
+platforms: [linux, macos, windows]
 metadata:
   hermes:
     tags: [sketch, mockup, design, ui, prototype, html, variants, exploration, wireframe, comparison]

skills/creative/songwriting-and-ai-music/SKILL.md

@@ -2,6 +2,7 @@
 name: songwriting-and-ai-music
 description: "Songwriting craft and Suno AI music prompts."
 tags: [songwriting, music, suno, parody, lyrics, creative]
+platforms: [linux, macos, windows]
 triggers:
   - writing a song
   - song lyrics

skills/creative/touchdesigner-mcp/SKILL.md

@@ -4,6 +4,7 @@ description: "Control a running TouchDesigner instance via twozero MCP — creat
 version: 1.1.0
 author: kshitijk4poor
 license: MIT
+platforms: [linux, macos, windows]
 metadata:
   hermes:
     tags: [TouchDesigner, MCP, twozero, creative-coding, real-time-visuals, generative-art, audio-reactive, VJ, installation, GLSL]