refactor: extract @hyperframes/parsers, @hyperframes/lint, @hyperframes/studio-server

[miguel-heygen]

Summary

• Extracts three new publishable packages from `@hyperframes/core`:
  • `@hyperframes/parsers` — HTML + GSAP AST parsers, previously in `packages/core/src/parsers/`
  • `@hyperframes/lint` — composition linter (`lintHyperframeHtml`, `lintProject`), previously in `packages/core/src/lint/`
  • `@hyperframes/studio-server` — Hono-based studio API + adapter helpers, previously in `packages/core/src/studio-api/`
• All three packages are versioned and published alongside the rest of the monorepo (added to `scripts/set-version.ts` and `.github/workflows/publish.yml`)
• Dependency chain after split: `parsers` ← `core` ← `lint` ← `cli`/`producer`; `studio-server` depends on `core` + `parsers`
• `@hyperframes/core` barrel continues to re-export parser types and functions for backwards compatibility; consumers can also import directly from `@hyperframes/parsers` or `@hyperframes/lint`
• Adds `"node": "./dist/..."` as first export condition on all TypeScript-source entries in the four affected packages — required because Node's native ESM (used during Vite config loading) cannot resolve `.js` specifiers to `.ts` source files; bundlers and IDEs continue to use the `"import"` condition which points to `./src/`
• Root `build` script now builds `parsers`/`lint`/`studio-server` first; `dev` script pre-builds `studio-server` before starting Vite

Test plan

• `bun run build` passes end-to-end (all packages build)
• `bun run test` passes (parsers: 660 tests, lint: 244 tests, CLI: 1047 tests)
• `bun run verify:packed-manifests` passes
• `bun run typecheck` (all packages)
• `bun dev` starts the studio without errors

E2E — verify CLI + studio locally

Run these from the repo root after checking out this branch. The `studio-test/` directory included in this PR is a ready-made composition for manually exercising the studio.

# 1. Full build (parsers/lint/studio-server build first, then the rest)
bun install && bun run build

# 2. Smoke-test core CLI commands
node packages/cli/dist/cli.js --version          # expect: 0.7.x
node packages/cli/dist/cli.js lint --project studio-test   # expect: 0 errors, 0 warnings
node packages/cli/dist/cli.js info --project studio-test   # expect: 1920×1080, 8s, 6 elements

# 3. Open the studio with the test composition
node packages/cli/dist/cli.js preview --project studio-test
# → opens http://localhost:3002 in your browser
# → studio loads the "Build videos with HyperFrames" title card (dark bg, 8s, 6 tracks)
# → scrub the timeline, press play — all 6 GSAP animations should fire in sequence
# → edit a CSS value in index.html and confirm hot-reload in the studio

# 4. Confirm the project API responds
curl http://localhost:3002/api/projects
# expect: {"projects":[{"id":"studio-test",...}]}

# 5. Confirm the studio dev server starts without Vite config errors (separate terminal)
bun dev
# expect: "@hyperframes/studio-server build: ESM ⚡️ Build success"
#         "VITE ready in <N> ms" with no ERR_MODULE_NOT_FOUND

The `studio-test/index.html` composition intentionally uses all four refactored packages:
parsers (HTML AST + hf-id injection), lint (0-error validation), studio-server (API + font compiler),
and core (GSAP adapter + runtime). A healthy studio load confirms the full package graph is wired correctly.

[miguel-heygen]

This PR has been split into three independently-reviewable units. Closing in favor of:

• PR refactor: extract @hyperframes/parsers from core #1755 — refactor/extract-parsers: Extract @hyperframes/parsers (link)
• PR refactor: extract @hyperframes/lint from core #1756 — refactor/extract-lint: Extract @hyperframes/lint — depends on refactor: extract @hyperframes/parsers from core #1755 (link)
• PR refactor: extract @hyperframes/studio-server from core #1757 — refactor/extract-studio-server: Extract @hyperframes/studio-server — depends on refactor: extract @hyperframes/parsers from core #1755, independent of refactor: extract @hyperframes/lint from core #1756 (link)

Merge order: #1755 first, then #1756 and #1757 can land in any order (rebase onto main after #1755 merges).