refactor(lint): split monolithic test file into per-rule-module test files

[miguel-heygen]

Summary

• Splits the 872-line hyperframeLinter.test.ts into focused per-domain test files matching the rule module structure from refactor(lint): break 1,314-line monolith into focused rule modules with plugin system #170
• Tests still use the public API (lintHyperframeHtml) — no internals exposed
• Fixes misplaced tests: gsap_css_transform_conflict tests were inside describe("lintScriptUrls"), caption/adapter tests were inside describe("template_literal_selector rule")

New structure

src/lint/
  hyperframeLinter.test.ts   — orchestrator integration + lintScriptUrls (8 tests)
  rules/
    core.test.ts             — root attrs, timeline registry, host id (6 tests)
    media.test.ts            — duplicate ids, missing id/src, preload (6 tests)
    gsap.test.ts             — clip element, transform conflict, missing script (12 tests)
    captions.test.ts         — caption exit, overflow, relative position (5 tests)
    composition.test.ts      — external script, template literal selector (5 tests)
    adapters.test.ts         — missing Lottie/Three.js scripts (8 tests)

Test plan

• 404 tests pass (402 before — 2 extra from previously misplaced adapter tests now correctly counted)
• Lint + format clean

[miguel-heygen]

Merge activity

• Apr 1, 4:30 PM UTC: @miguel-heygen merged this pull request with Graphite.