feat(registry): add ChatGPT and Claude exchange templates - #3244

Content-only registry PR. Reviewed the envelope end-to-end:

Registry consistency

• registry/blocks/chatgpt-exchange/registry-item.json: 3 SF Pro Text subsets declared → HTML refs sfprotext-{regular,medium,semibold} only. Match.
• registry/blocks/claude-exchange/registry-item.json: Charter regular/bold + 3 SF Pro Text → HTML refs charter-{regular,bold} + sfprotext-{regular,medium,semibold}. Match.
• registry/registry.json now 382 items; both new blocks present with hyperframes:block type.
• 8 woff2 files under registry/blocks/*/assets/fonts/ mirror the item declarations exactly.
• Runtime-boundary-only claim (no snapshots/QC/renders/.DS_Store) verified against the file list.
• Docs mirror in docs/public/catalog/items/*/assets/fonts/ symmetric; catalog index gets both entries.

CI state

• 8 HF canonical required checks (Semantic PR title / Test: runtime contract / Typecheck / Build / regression / Test / Render on windows-latest / Tests on windows-latest) SKIPPED as expected via Detect changes for a docs/registry-only diff.
• Preflight red = oven-sh/setup-bun socket hang up at 18:04:48Z — infra flake, retriable.
• Catalog: search index covers the registry red = intentional deferred-parity gate; the check's own message says maintainer regenerates vectors at merge.

No correctness or contract findings.

— Via

Blocking: the PR vendors and republishes actual Apple SF Pro Text font binaries. The files identify themselves as SF Pro Text and © 2015-2026 Apple Inc. All rights reserved (for example registry/blocks/chatgpt-exchange/assets/fonts/sfprotext-regular.woff2). Apple's SF license says the font may not be embedded in products or redistributed / made available over a network. This PR exposes the subsets through the public registry, generated Catalog assets, and install packages. Please replace these three faces in both templates with a redistributable licensed font (for example Inter or another OFL face), regenerate the Catalog payload/pages, and remove every SF Pro binary copy.

CI also has a real merge gate: Catalog: search index covers the registry reports both new items missing from the vector artifact. The setup-bun Preflight failure is an infrastructure retry, but the search-index failure needs maintainer regeneration before merge.

Re-reviewed fresh head d643c561 against the two prior blockers. Both are resolved.

• Every SF Pro/Charter binary and reference was removed from the registry, generated Catalog item trees, payloads, and docs.
• The replacement binaries identify as Inter and EB Garamond, and both ship with their complete SIL OFL 1.1 license text in the install manifests.
• Registry HTML references and manifest file lists are symmetric; no stale old hashes/names remain.
• The semantic-search artifact now has 373/373 vectors, includes both new names, and its revision matches registry.json; local coverage check passes.
• Latest-per-check CI at d643c561 has no failures: Catalog preview render, docs validation, artifact coverage, formatting, CodeQL, Mintlify, and the routing gates are green; code-path lanes are correctly skipped for this content-only diff.

Targeted local verification: registry lint passes; registry target + Catalog payload tests 42/42 pass; artifact coverage reports every searchable field matches. Clean to merge.