feat(hosts): /land-and-deploy and /modernize run only when typed on Claude Code and Cursor (C1) (#3808)

* feat(hosts): manual-only /land-and-deploy and /modernize on Claude Code and Cursor (C1, GST-804)

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

* fix(routing): host-neutral router wording, update repo CLAUDE.md and the onboarding fixture for the manual-only skills

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

* fix(gen): escape conditionalFields keys, anchor values, skip keys the template already sets

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

* fix(modernize): trim always-on description to stay under the 8000-token context budget

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

---------

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

scripts/gen-skill-docs.ts

@@ -486,13 +486,21 @@ policy:
 
 /**
  * Transform frontmatter for external hosts.
- * Claude: strips `sensitive:` field (only Factory uses it).
+ * Claude: strips template-only fields, adds disable-model-invocation to manual_only skills.
  * Codex: keeps name + description only, enforces 1024-char limit.
  * Factory: keeps name + description + user-invocable, conditionally adds disable-model-invocation.
  */
 function transformFrontmatter(content: string, host: Host): string {
   const hostConfig = getHostConfig(host);
   const fm = hostConfig.frontmatter;
+  const templateFrontmatter = content.startsWith('---\n') ? content.slice(4, content.indexOf('\n---', 4)) : '';
+  const escape = (s: unknown) => String(s).replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+  const conditionalLines = (fm.conditionalFields || [])
+    .filter(rule => Object.entries(rule.if).every(([k, v]) => new RegExp(`^${escape(k)}:[ \\t]*${escape(v)}[ \\t]*$`, 'm').test(templateFrontmatter)))
+    .flatMap(rule => Object.entries(rule.add))
+    .filter(([key]) => !new RegExp(`^${escape(key)}:`, 'm').test(templateFrontmatter))
+    .map(([key, value]) => `${key}: ${value}\n`)
+    .join('');
 
   if (fm.mode === 'denylist') {
     // Denylist mode: strip listed fields, keep everything else
@@ -503,7 +511,7 @@ function transformFrontmatter(content: string, host: Host): string {
         content = content.replace(new RegExp(`^${field}:\\s*.*\\n`, 'm'), '');
       }
     }
-    return content;
+    return conditionalLines ? content.replace('\n---\n', () => `\n${conditionalLines}---\n`) : content;
   }
 
   // Allowlist mode: reconstruct frontmatter with only allowed fields
@@ -546,19 +554,7 @@ function transformFrontmatter(content: string, host: Host): string {
     }
   }
 
-  // Add conditional fields
-  if (fm.conditionalFields) {
-    for (const rule of fm.conditionalFields) {
-      const match = Object.entries(rule.if).every(([k, v]) =>
-        new RegExp(`^${k}:\\s*${v}`, 'm').test(frontmatter)
-      );
-      if (match) {
-        for (const [key, value] of Object.entries(rule.add)) {
-          newFm += `${key}: ${value}\n`;
-        }
-      }
-    }
-  }
+  newFm += conditionalLines;
 
   // Preserve additional keepFields beyond name and description
   if (fm.keepFields) {
@@ -853,7 +849,7 @@ function processTemplate(tmplPath: string, host: Host, options: RenderOptions):
   // metadata gets the updated description with voice triggers included.
   const postProcessDescription = extractNameAndDescription(content).description;
 
-  // For Claude: strip sensitive: field (only Factory uses it)
+  // For Claude: strip template-only fields, add conditional fields
   // For external hosts: route output, transform frontmatter, rewrite paths
   let symlinkLoop = false;
   let metadata: { outputPath: string; content: string } | undefined;