49 lines
2.4 KiB
Markdown
49 lines
2.4 KiB
Markdown
# Phase 4 report
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Shipped on `codex/phase4`: plan cdd26b6; six seams 3c9a24a, 5fb9564,
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8e7fa19, 94ea211, 0475a18, b335f95; failure handling 2c50035.
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Scope-resolved dependency inventory and byte/coupling rankings are in
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phase4-seams.md; commands, output excerpts and results in phase4-verification.md.
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Original source bytes moved:
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| Seam | Bytes |
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|---|---:|
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| Eager shell/shared views/Settings/rail | 98,378 |
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| Presenter | 9,492 |
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| Remote client | 30,421 |
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| Watch party | 22,833 |
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| Share/External | 13,334 |
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| Stats view | 7,074 |
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`app.js`: **587,029 → 408,473 bytes, −30.42%** (178,556 net; 2,976 bytes
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facade overhead). Shell definitions load before app; required eager features
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stay in RAM. Lazy classic clients register on window.YT. Synchronous playback
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hooks remain synchronous; configured/URL sessions resume. Stats tracking loads
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without parsing its view. New chunks are manifested and retained in legacy SHELL.
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Player, queue, persistence, boot, Notes/editor, service mode, EQ/level, sleep/drift,
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Gestures and remaining editor/export glue stay in app.js. Exact source fingerprints
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protect playback/tracking bodies. Now-playing metadata mutations inside Player
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remain there; markup, action paint and mini bar are eager. Stateful groups remain
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pinned; live replacement stays disabled without disposal/state handoff.
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Actual LTE measurements, Chromium/WebKit: initial compressed JS/CSS
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**210,419/255,200** versus Phase 3 221,307/274,813; matched Phase 0
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276,414/338,940. Isolated three-run Chromium median boot **7,010 ms**, long tasks
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**275 ms** versus Phase 0 10,480/454 (Phase 3 7,193/287).
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WebKit boot 2,977 ms; no long-task API. Presenter edit transfers only its chunk
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(3,118/3,587 bytes), plus index/manifest/worker checks: total **33,408/41,364**.
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Core updates: 125,795/147,259 bytes. Offline boot: 180/90 ms, zero network.
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Verification: **198 frontend/183 server tests**, no skips; both-engine cache smoke,
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hidden timers, layouts/staged contracts/pinning/playback guard, b77938a migration
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with/without stalls, and both rollback flags pass. Each seam had its own green
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checks/commit. No deployment.
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Limits: WebKit FCP 2,401 versus Phase 0 1,100 ms still regresses. Concurrent-run
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Chromium long tasks were 495 ms; isolated repeat is reported separately. Warm
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counters include idle downloads; five-run comparisons await Phase 5. Owner must
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check real-iPhone cached first-use/layouts, Remote/Party/Presenter, update guard,
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30-minute locked audio/resume and OPFS quota coexistence.
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