fix(lint): ignore audio clip start boundaries

[miguel-heygen]

Summary

• exclude <audio class="clip"> starts from visual scene-boundary detection
• prevent unrelated SFX timing from triggering gsap_exit_missing_hard_kill
• retain hard-kill enforcement at actual visual clip boundaries

Source feedback: https://heygen.slack.com/archives/C0BGC335AQY/p1783984033363839

Tests

• bun run --filter @hyperframes/lint test -- src/rules/gsap.test.ts
• bunx oxfmt --check packages/lint/src/rules/gsap.ts packages/lint/src/rules/gsap.test.ts
• bunx oxlint packages/lint/src/rules/gsap.ts packages/lint/src/rules/gsap.test.ts
• pre-commit typecheck

[miguel-heygen]

Closing in the owner-scoped backlog value sweep. This is a narrow lint/audit/docs/example/skills refinement, is currently conflicting, or adds more maintenance surface than its demonstrated user impact justifies. Reopen only if a current reproducible case makes it a priority again.

[WaterrrForever]

Same concern as #2371: this is a reproduction-backed lint false positive (<audio class="clip"> starts firing gsap_exit_missing_hard_kill), and lint errors gate users' builds. I checked #2413 — it touches gsap.ts but doesn't cover the audio-boundary case (no gsap_exit_missing_hard_kill changes in the diff). Could this ride along in #2413 since it's already consolidating lint/audit correctness? +23/-0 with tests.