feat(sdk): stage 5 — export adapter factories from package root

[vanceingalls]

Stage 5 — public adapter factory exports

Ships the public entry points for the SDK's adapter layer. The concrete adapters already existed internally (memory.ts, headless.ts, fs.ts) and pass the T13 contract suite, but index.ts only re-exported the type interfaces — so consumers had to reach into deep src/adapters/* paths to instantiate one. This wires them to the package root.

What's exported

Factory	Adapter	Use case
createHeadlessAdapter()	PreviewAdapter (no-op)	Agents, CI, SSR — no browser, no DOM
createMemoryAdapter()	PersistAdapter (in-memory)	Tests, demos, headless open with no storage backend
createFsAdapter(opts)	PersistAdapter (node fs)	Local dev — versioned history on disk

FsAdapterOptions is exported alongside createFsAdapter.

Why this completes the headless story

Agents and CI can now open a composition with zero browser and zero disk:

import { openComposition, createHeadlessAdapter, createMemoryAdapter } from "@hyperframes/sdk";

const session = await openComposition(html, {
  preview: createHeadlessAdapter(),
  persist: createMemoryAdapter(),
});

Scope

• S3 / production HTTP adapters are post-Pacific — intentionally not included.
• No new adapter implementations; this is purely the public export surface.

Verification

• index.ts only, +6 lines
• oxlint clean, oxfmt clean
• sdk typecheck clean
• 156/156 sdk tests pass

🤖 Generated with Claude Code

[vanceingalls]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• feat(sdk): stage 6 — sub-composition scoped ids (F9) #1434
• feat(sdk): stage 5 — export adapter factories from package root #1432 👈 (View in Graphite)
• docs(sdk-playground): accurate README with stage coverage and CanResult #1429
• feat(sdk): stage 4 — canUndo/canRedo, removeElement GSAP cascade, override-set cleanup #1431
• feat(sdk): can() returns CanResult; T4 dispatch-boundary tests #1426
• fix(sdk): fs adapter flush() tracks in-flight writes; add to T13 contract suite #1425
• feat(sdk): file-backed fs adapter + setTiming GSAP-script sync; add sdk-playground #1423
• refactor(core): swap studio-api read path from recast to acorn parser (T6e) #1392
• feat(core): parse-parity suite for acorn parser (T6d) #1370 : 1 other dependent PR (#1379 )
• feat(core): acorn GSAP write path — magic-string offset-splice (T6c) #1369
• feat(core): acorn GSAP read path with T6b differential corpus tests #1368
• main

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