Fix schema download actions and family bundle exports on capabilities page

[GsCommand]

Motivation

• Ensure verb-level schema download and copy buttons on the Capabilities page are real, functional, and only expose canonical schema URLs rather than placeholders.
• Use the canonical CLAS repo as the authoritative source and avoid inventing or faking schema content when local files are not present.

Description

• Updated public/capabilities.html to dynamically resolve per-verb Trust Verification schema paths using a TRUST_VERBS list and a TRUST_SCHEMA_REGISTRY, checking local /schemas/trust/... paths first and falling back to CLAS raw URLs when reachable.
• Implemented urlExists (HEAD fetch) and resolveSchemaForVerb helpers so modal actions are only enabled when an actual target exists, and download links get real href and download attributes.
• Added family bundle generation functions buildFamilySchemaBundle and downloadFamilyBundle, and wired the family/global schema buttons to produce a trust-verification-v1.schemas.json bundle download instead of pointing at a dead placeholder.
• Preserved build-plan behavior, updated schema-index download to provide an explicit filename, and made the manifest download control explicitly disabled with text when no live manifests exist; no schema files were copied into the repo in this change.

Testing

• Validated the modified inline script parses and runs without syntax errors using Node new Function(...) (success).
• Confirmed repository change and commit via git status --short and a local git commit (success).
• Attempted to clone commandlayer-clas for direct content copy but network access to GitHub failed (HTTP/CONNECT 403) so no upstream files were imported in this patch (failure to fetch external repo, handled by falling back to runtime HEAD checks in-browser).

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Codex Task

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Project	Deployment	Actions	Updated (UTC)
commandlayer-commandlayer-org	Ready	Preview, Comment	May 26, 2026 1:18am
commandlayer-org	Ready	Preview, Comment	May 26, 2026 1:18am
commandlayer-org111	Ready	Preview, Comment	May 26, 2026 1:18am