[TheGreatAxios]

Summary

• Sticky and animation setIntervals are gone; motion uses the renderer Timeline; idle snow is a post-process; shell tails repaint from feed appends on one frame.
• Glyph math stays in mark-raster and ramp-glyphs because Timeline easings cannot reproduce markFrame, rampPulse, or advanceRevealChars.
• Idle host arms no interval; a feed append schedules one frame.
• The rename and import rewrites are the base branch, not this diff.

Verification

• Pre-commit on this branch ran tsc --noEmit and bun build ./src/index.ts; both passed.

Fixes CL-10640

[linear-code]

CL-10640

[corbits-triage]

Triage: Pass

No changes needed from you. A maintainer will review this pull request.

[TheGreatAxios]

Independent perf verification for this PR (measure-only lane, no source touched). Post-merge absolute behavior + structural proof (honest caveat at the end).

• 200ms sticky poll: gone. Bounded grep for setInterval|clearInterval|setTimeout|clearTimeout in src/tui/product-host.ts returns zero matches (pre-merge had setInterval(..., 200) firing paint+sync 5×/s at idle). One 250ms watchdog remains in runtime-bridge.ts:188-194 but arms only while a turn/quota is live — quota-retry/stall-recovery, never paint. Out of claim scope.
• Timeline ownership: frame-timeline.ts (createTimeline/getTimelineEngine, unregister on stop) adopted at 5 sites; clock arms only while lane/linger visible, dispose() stops clock + unsubscribes feed + cancels rAF.
• Feed bounding, measured: 200 chunks × ~1033 B (~206.8 KiB in) → retained 7238 B / 7 lines, bound (8192 B) holds, oldest-dropped-first. Single 100 KiB chunk → truncated to 6400 B tail. Empty append → 0 notices.
• Frame coalescing, measured: 50 synchronous appends → exactly 1 rAF; tail preview + elision correct; idle second frame → 0 rAF; post-dispose append → no throw, 0 rAF. Frame latency over 25 bursts: p50 0.30 ms, p95 0.86 ms (headless harness).
• viewportCulling:true present on transcript + overlay viewport (verified present; note it pre-dates this CL via earlier commits).
• Caveat: comparative before/after wall-clock is UNMEASURABLE in the headless harness (old path needed a live timer; old feed API has no subscribe). Everything above is post-merge absolute + pre/post structural diff.

Claims verified as stated.