Add interactive verb discovery panel to capabilities page

[GsCommand]

Motivation

• Make each verb pill on the Capabilities page act as a protocol discovery control so users can inspect verb details without triggering downloads or changing the page layout.
• Expose verb metadata and available actions (download schema/manifest, copy example, view source, add to build plan) while preventing broken links when per-verb schema files are not present.

Description

• Modified only public/capabilities.html to add a lightweight, keyboard-accessible verb detail modal and related CSS, keeping original layout, spacing, colors, and existing build-plan behavior intact.
• Turned .cap-pill elements into interactive controls with role="button", tabindex, aria-label, click and Enter/Space handlers, and a visible focus outline so pills remain visually similar but are keyboard-accessible.
• Modal shows verb name, capability family, status, short description, actions, and a close control; live Trust Verification verbs surface the requested action set while per-verb schema download buttons are disabled when no schema files are available, and Draft/Planned verbs show a "Schema not published yet" message plus Add to build plan.
• Added global actions near the Build Plan card: Download all live schemas (present but disabled if no live schema list is available) and Download all live manifests (wired to the existing /capabilities/trust-verification/manifest.json), and preserved all previous export/copy/build plan handlers.

Testing

• Ran rg --files public | rg 'capabilities|schema|manifest|trust-verification' to confirm available manifest/schema paths and ensure manifest linkage, and the command completed successfully.
• Ran rg --files | rg '(CLAS|clas|schema)' | head -n 80 to inspect schema-related files and verify there were no per-verb schema files to link to, and the command completed successfully.
• Inspected the modified file with nl -ba public/capabilities.html and observed the injected CSS/HTML/JS for the modal and pill behavior; this inspection completed successfully.
• Committed the change with git commit after staging, and the commit succeeded.

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Codex Task

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Project	Deployment	Actions	Updated (UTC)
commandlayer-commandlayer-org	Ready	Preview, Comment	May 26, 2026 12:57am
commandlayer-org	Ready	Preview, Comment	May 26, 2026 12:57am
commandlayer-org111	Ready	Preview, Comment	May 26, 2026 12:57am