feat(core): expose hf-ids as subpath export for @hyperframes/sdk

[vanceingalls]

Summary

Exposes hf-ids as a dedicated subpath export from @hyperframes/core so @hyperframes/sdk can import ID-stamping logic without pulling in the full core bundle.

• Adds "exports" entry for ./hf-ids in packages/core/package.json
• No change to the existing top-level export — no breaking change for existing consumers

Why

@hyperframes/sdk needs parseMutable/stampHfIds from core. A subpath export isolates that boundary and keeps the SDK bundle lean.

Test plan

• bun run build — both packages build without errors
• bun test packages/sdk — import resolves correctly

🤖 Generated with Claude Code

[vanceingalls]

• fix(sdk,core): css tokenizer, override-set replay, setattribute safety, persist errors #1350
• fix(studio): watch external project dirs so preview ETag invalidates #1347
• fix(studio,core): persist manual position edits for GSAP-owned elements #1346
• feat(lint): add gsap_studio_edit_blocked rule for manual timeline + GSAP element targeting #1345
• feat(sdk): session API, optional history + persist-queue, adapters — Phase 3a complete #1325
• feat(sdk): scaffold @hyperframes/sdk — engine layer (model, RFC 6902 patches, mutate, apply-patches) #1324
• feat(core): expose hf-ids as subpath export for @hyperframes/sdk #1323 👈 (View in Graphite)
• main

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[miguel-heygen]

Clean, minimal change. The subpath export is correctly placed in both the dev (src/) and dist (publishConfig.exports) conditions, consistent with the pattern used by ./gsap-parser and ./runtime/mediaVolumeEnvelope. No issues.

[james-russo-rames-d-jusso]

Quick approve from my side. Two new entries in packages/core/package.json exports (one src-mode for dev workspace consumers, one publish-mode for the dist build) pointing @hyperframes/core/hf-ids at the existing parsers/hfIds.ts module.

Verified:

• packages/core/src/parsers/hfIds.ts exists at this SHA and exposes the expected surface (mintHfId, ensureHfIds).
• Both exports symmetrically defined under exports. and publishConfig.exports. — no risk of dev-mode + publish-mode drift.
• Alphabetic ordering within the exports map is preserved (sits between mediaVolumeEnvelope and gsap-parser).
• The subpath name hf-ids (hyphen) follows the existing convention for kebab-case subpaths (gsap-parser, dom-edit, etc.). Internal file is hfIds.ts (camelCase) — fine, file naming and subpath naming are independent contracts.

The SDK consumer in #1324 (packages/sdk/src/document.ts:12) actually uses this import — confirmed it resolves correctly through the workspace.

Trivial enabler. LGTM.

— Review by Rames D Jusso