From 4950d3e41713c675290fd4b2bdf52580bcfdcc67 Mon Sep 17 00:00:00 2001
From: Jonathan Sykes <telemagnadon@gmail.com>
Date: Thu, 8 Oct 2026 00:21:19 +0800
Subject: [PATCH] Document incremental sync verification and performance gaps

---
 perf/README.md                                |   31 +
 perf/results/phase2-final-2026-10-07.json     | 2082 +++++++++++++++++
 .../phase2-hashing-rollback-2026-10-07.json   |  131 ++
 .../phase2-migration-lossy-2026-10-07.json    |   41 +
 ...ase2-migration-unthrottled-2026-10-07.json |   41 +
 perf/results/phase2-rollback-2026-10-07.json  |  131 ++
 plans/phase2-report.md                        |   43 +
 7 files changed, 2500 insertions(+)
 create mode 100644 perf/results/phase2-final-2026-10-07.json
 create mode 100644 perf/results/phase2-hashing-rollback-2026-10-07.json
 create mode 100644 perf/results/phase2-migration-lossy-2026-10-07.json
 create mode 100644 perf/results/phase2-migration-unthrottled-2026-10-07.json
 create mode 100644 perf/results/phase2-rollback-2026-10-07.json
 create mode 100644 plans/phase2-report.md

diff --git a/perf/README.md b/perf/README.md
index 55b3ed0..32a4606 100644
--- a/perf/README.md
+++ b/perf/README.md
@@ -181,3 +181,34 @@ which receive hashed URLs as HTML scripts. Font preloads retain plain URLs to ma
 `fonts.css`; the webmanifest and its icon URLs also stay plain and precached.
 `piano-engine.mjs` is manifested but is historically absent from SHELL; this
 existing offline piano limitation is deferred to the loader phase.
+
+## Phase 2 incremental-sync verification
+
+The current migration harness verifies the production page's own ready fast path
+into `ytplayer-assets`: no `__ytpfresh` downloads, no reload before Refresh UI,
+one banner/reload, an open N-1 tab, playback guard, incremental refresh after
+an eviction, and offline launch. It preserves the legacy user-triggered reload
+exception. Async CacheStorage/registration conditions are polled with awaited
+`page.evaluate`; Playwright's `waitForFunction` does not poll async predicates.
+
+```bash
+node perf/migration.mjs --browser all --profile lossy
+node perf/migration.mjs --browser all --profile unthrottled
+node perf/baseline.mjs --runs 1 --browser all --profile lte --scenario all \
+  --out perf/results/phase2-final-2026-10-07.json \
+  --compare perf/results/after-phase0-2026-10-07.json
+ASSET_SYNC=0 node perf/baseline.mjs --runs 1 --browser all --profile lte \
+  --scenario offline --out perf/results/phase2-rollback-2026-10-07.json
+ASSET_HASHING=0 node perf/baseline.mjs --runs 1 --browser all --profile lte \
+  --scenario offline --out perf/results/phase2-hashing-rollback-2026-10-07.json
+```
+
+Results now include response paths/statuses and compressed response-body bytes
+for cold/update runs. The total includes service-worker script checks/imports;
+inspect individual responses to distinguish those from app asset downloads.
+Migration results are `phase2-migration-<profile>-2026-10-07.json`.
+`ASSET_SYNC=0` selects the legacy path while preserving the persistent utility
+cache. `ASSET_HASHING=0` also selects legacy sync because single-tag URLs cannot
+pass per-file hash checks. Current assets.json groups all block; idle loading and
+lazy parsing await Phase 3. Incremental mode now caches the manifested
+`piano-engine.mjs` even though it remains absent from the legacy SHELL.
diff --git a/perf/results/phase2-final-2026-10-07.json b/perf/results/phase2-final-2026-10-07.json
new file mode 100644
index 0000000..e10f17e
--- /dev/null
+++ b/perf/results/phase2-final-2026-10-07.json
@@ -0,0 +1,2082 @@
+{
+  "date": "2026-10-07T16:14:45.518Z",
+  "commit": "92404563b3291c7986239092981ff0ef5f7a3b2a",
+  "runsConfigured": 1,
+  "browsers": {
+    "chromium": {
+      "lte": {
+        "cold": {
+          "requestCount": {
+            "median": 102,
+            "min": 102,
+            "max": 102,
+            "values": [
+              102
+            ]
+          },
+          "wireBytes": {
+            "median": 624762,
+            "min": 624762,
+            "max": 624762,
+            "values": [
+              624762
+            ]
+          },
+          "fcp": {
+            "median": 1560,
+            "min": 1560,
+            "max": 1560,
+            "values": [
+              1560
+            ]
+          },
+          "lcp": {
+            "median": 1900,
+            "min": 1900,
+            "max": 1900,
+            "values": [
+              1900
+            ]
+          },
+          "domContentLoaded": {
+            "median": 11037,
+            "min": 11037,
+            "max": 11037,
+            "values": [
+              11037
+            ]
+          },
+          "bootDone": {
+            "median": 11155,
+            "min": 11155,
+            "max": 11155,
+            "values": [
+              11155
+            ]
+          },
+          "longTaskTotal": {
+            "median": 389,
+            "min": 389,
+            "max": 389,
+            "values": [
+              389
+            ]
+          },
+          "swInstallDuration": {
+            "median": 41194,
+            "min": 41194,
+            "max": 41194,
+            "values": [
+              41194
+            ]
+          },
+          "swInstallBytes": {
+            "median": 624762,
+            "min": 624762,
+            "max": 624762,
+            "values": [
+              624762
+            ]
+          },
+          "storageEstimate": {
+            "usage": 3493337,
+            "quota": 5372202457
+          },
+          "mediaReady": {
+            "median": null,
+            "min": null,
+            "max": null,
+            "values": [
+              null
+            ]
+          },
+          "autoplayBlocked": true,
+          "wireBytesByType": {
+            "html": 19030,
+            "js": 275947,
+            "css": 65750,
+            "fonts": 254048,
+            "images": 6278,
+            "media": 0,
+            "api": 3078,
+            "other": 631
+          },
+          "requests": [
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+              "url": "http://127.0.0.1:5666/?v=benchmedia01",
+              "status": 200,
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+              "status": 200,
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+              "url": "http://127.0.0.1:5666/fonts/HankenGrotesk-latin.woff2",
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+            {
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+            },
+            {
+              "url": "http://127.0.0.1:5666/api/manifest",
+              "status": 200,
+              "bytes": 3179
+            },
+            {
+              "url": "http://127.0.0.1:5666/index.html?v=5b2a5a92bf",
+              "status": 200,
+              "bytes": 11497
+            },
+            {
+              "url": "http://127.0.0.1:5666/theme-glass.css?v=35bcf15cee",
+              "status": 200,
+              "bytes": 6075
+            }
+          ]
+        }
+      }
+    }
+  }
+}
\ No newline at end of file
diff --git a/perf/results/phase2-hashing-rollback-2026-10-07.json b/perf/results/phase2-hashing-rollback-2026-10-07.json
new file mode 100644
index 0000000..c9ca140
--- /dev/null
+++ b/perf/results/phase2-hashing-rollback-2026-10-07.json
@@ -0,0 +1,131 @@
+{
+  "date": "2026-10-07T16:00:49.668Z",
+  "commit": "bb446c717f92ef912f5000ddc757b9d1071120dc",
+  "runsConfigured": 1,
+  "browsers": {
+    "chromium": {
+      "lte": {
+        "offline": {
+          "requestCount": {
+            "median": 0,
+            "min": 0,
+            "max": 0,
+            "values": [
+              0
+            ]
+          },
+          "wireBytes": {
+            "median": 0,
+            "min": 0,
+            "max": 0,
+            "values": [
+              0
+            ]
+          },
+          "fcp": {
+            "median": 76,
+            "min": 76,
+            "max": 76,
+            "values": [
+              76
+            ]
+          },
+          "lcp": {
+            "median": 300,
+            "min": 300,
+            "max": 300,
+            "values": [
+              300
+            ]
+          },
+          "domContentLoaded": {
+            "median": 233,
+            "min": 233,
+            "max": 233,
+            "values": [
+              233
+            ]
+          },
+          "bootDone": {
+            "median": 279,
+            "min": 279,
+            "max": 279,
+            "values": [
+              279
+            ]
+          },
+          "reloadDuration": {
+            "median": 306,
+            "min": 306,
+            "max": 306,
+            "values": [
+              306
+            ]
+          }
+        }
+      }
+    },
+    "webkit": {
+      "lte": {
+        "offline": {
+          "requestCount": {
+            "median": 0,
+            "min": 0,
+            "max": 0,
+            "values": [
+              0
+            ]
+          },
+          "wireBytes": {
+            "median": 0,
+            "min": 0,
+            "max": 0,
+            "values": [
+              0
+            ]
+          },
+          "fcp": {
+            "median": 129,
+            "min": 129,
+            "max": 129,
+            "values": [
+              129
+            ]
+          },
+          "lcp": {
+            "median": 158,
+            "min": 158,
+            "max": 158,
+            "values": [
+              158
+            ]
+          },
+          "domContentLoaded": {
+            "median": 117,
+            "min": 117,
+            "max": 117,
+            "values": [
+              117
+            ]
+          },
+          "bootDone": {
+            "median": 153,
+            "min": 153,
+            "max": 153,
+            "values": [
+              153
+            ]
+          },
+          "reloadDuration": {
+            "median": 165,
+            "min": 165,
+            "max": 165,
+            "values": [
+              165
+            ]
+          }
+        }
+      }
+    }
+  }
+}
\ No newline at end of file
diff --git a/perf/results/phase2-migration-lossy-2026-10-07.json b/perf/results/phase2-migration-lossy-2026-10-07.json
new file mode 100644
index 0000000..b96e7c5
--- /dev/null
+++ b/perf/results/phase2-migration-lossy-2026-10-07.json
@@ -0,0 +1,41 @@
+{
+  "commit": "b77938a",
+  "results": [
+    {
+      "browser": "chromium",
+      "oldTag": "1175f1a1d2c1",
+      "newTag": "4f7090fff60c",
+      "banners": 1,
+      "updateReloads": 1,
+      "cachedFiles": 92,
+      "durationMs": 27514,
+      "wireBytes": 622009,
+      "offline": true,
+      "legacyURLs": 21,
+      "profile": "lossy",
+      "userInitiatedOnly": true,
+      "playbackGuard": true,
+      "evictionRepair": true,
+      "incrementalRefresh": true,
+      "offlineTransportErrors": 0
+    },
+    {
+      "browser": "webkit",
+      "oldTag": "1175f1a1d2c1",
+      "newTag": "4f7090fff60c",
+      "banners": 1,
+      "updateReloads": 1,
+      "cachedFiles": 92,
+      "durationMs": 19558,
+      "wireBytes": 731221,
+      "offline": true,
+      "legacyURLs": 21,
+      "profile": "lossy",
+      "userInitiatedOnly": true,
+      "playbackGuard": true,
+      "evictionRepair": true,
+      "incrementalRefresh": true,
+      "offlineTransportErrors": 4
+    }
+  ]
+}
diff --git a/perf/results/phase2-migration-unthrottled-2026-10-07.json b/perf/results/phase2-migration-unthrottled-2026-10-07.json
new file mode 100644
index 0000000..eed1c5e
--- /dev/null
+++ b/perf/results/phase2-migration-unthrottled-2026-10-07.json
@@ -0,0 +1,41 @@
+{
+  "commit": "b77938a",
+  "results": [
+    {
+      "browser": "chromium",
+      "oldTag": "1175f1a1d2c1",
+      "newTag": "4f7090fff60c",
+      "banners": 1,
+      "updateReloads": 1,
+      "cachedFiles": 92,
+      "durationMs": 10811,
+      "wireBytes": 630657,
+      "offline": true,
+      "legacyURLs": 21,
+      "profile": "unthrottled",
+      "userInitiatedOnly": true,
+      "playbackGuard": true,
+      "evictionRepair": true,
+      "incrementalRefresh": true,
+      "offlineTransportErrors": 0
+    },
+    {
+      "browser": "webkit",
+      "oldTag": "1175f1a1d2c1",
+      "newTag": "4f7090fff60c",
+      "banners": 1,
+      "updateReloads": 1,
+      "cachedFiles": 92,
+      "durationMs": 9283,
+      "wireBytes": 744401,
+      "offline": true,
+      "legacyURLs": 21,
+      "profile": "unthrottled",
+      "userInitiatedOnly": true,
+      "playbackGuard": true,
+      "evictionRepair": true,
+      "incrementalRefresh": true,
+      "offlineTransportErrors": 4
+    }
+  ]
+}
diff --git a/perf/results/phase2-rollback-2026-10-07.json b/perf/results/phase2-rollback-2026-10-07.json
new file mode 100644
index 0000000..f7c86fb
--- /dev/null
+++ b/perf/results/phase2-rollback-2026-10-07.json
@@ -0,0 +1,131 @@
+{
+  "date": "2026-10-07T15:55:07.011Z",
+  "commit": "54a07a0a2ae1711e441545b208c45c55b3318963",
+  "runsConfigured": 1,
+  "browsers": {
+    "chromium": {
+      "lte": {
+        "offline": {
+          "requestCount": {
+            "median": 0,
+            "min": 0,
+            "max": 0,
+            "values": [
+              0
+            ]
+          },
+          "wireBytes": {
+            "median": 0,
+            "min": 0,
+            "max": 0,
+            "values": [
+              0
+            ]
+          },
+          "fcp": {
+            "median": 72,
+            "min": 72,
+            "max": 72,
+            "values": [
+              72
+            ]
+          },
+          "lcp": {
+            "median": 72,
+            "min": 72,
+            "max": 72,
+            "values": [
+              72
+            ]
+          },
+          "domContentLoaded": {
+            "median": 225,
+            "min": 225,
+            "max": 225,
+            "values": [
+              225
+            ]
+          },
+          "bootDone": {
+            "median": 249,
+            "min": 249,
+            "max": 249,
+            "values": [
+              249
+            ]
+          },
+          "reloadDuration": {
+            "median": 262,
+            "min": 262,
+            "max": 262,
+            "values": [
+              262
+            ]
+          }
+        }
+      }
+    },
+    "webkit": {
+      "lte": {
+        "offline": {
+          "requestCount": {
+            "median": 0,
+            "min": 0,
+            "max": 0,
+            "values": [
+              0
+            ]
+          },
+          "wireBytes": {
+            "median": 0,
+            "min": 0,
+            "max": 0,
+            "values": [
+              0
+            ]
+          },
+          "fcp": {
+            "median": 109,
+            "min": 109,
+            "max": 109,
+            "values": [
+              109
+            ]
+          },
+          "lcp": {
+            "median": 138,
+            "min": 138,
+            "max": 138,
+            "values": [
+              138
+            ]
+          },
+          "domContentLoaded": {
+            "median": 101,
+            "min": 101,
+            "max": 101,
+            "values": [
+              101
+            ]
+          },
+          "bootDone": {
+            "median": 133,
+            "min": 133,
+            "max": 133,
+            "values": [
+              133
+            ]
+          },
+          "reloadDuration": {
+            "median": 145,
+            "min": 145,
+            "max": 145,
+            "values": [
+              145
+            ]
+          }
+        }
+      }
+    }
+  }
+}
\ No newline at end of file
diff --git a/plans/phase2-report.md b/plans/phase2-report.md
new file mode 100644
index 0000000..07c61fe
--- /dev/null
+++ b/plans/phase2-report.md
@@ -0,0 +1,43 @@
+# Phase 2 report
+
+Shipped on `codex/phase2`: plan `a1f16f2`; incremental sync/playback guards
+`54a07a0`; atomic state, exact hash rejection and retention `5b25cca`;
+single-tag rollback compatibility `bb446c7`; migration verification `5d1e5ec`;
+fail-closed status handling `9240456`.
+
+Persistent `ytplayer-assets` stores verified exact URLs and current/previous
+manifests. Downloads resume, use six workers/three attempts, and publish only
+complete blocking sets. Activation retains N-1 changed/removed files, prunes
+N-2, then deletes legacy caches; quota is logged. All current groups block;
+lazy parsing/background warming await Phase 3.
+
+Server gaps addressed: inject ASSET_SYNC and the hashed sync-core import,
+hash final worker bytes, compress manifest responses while preserving build
+ETags. ASSET_SYNC=0 selects legacy sync; ASSET_HASHING=0 also selects legacy.
+
+Verification: 168 frontend/181 server tests pass without skips. Chromium/WebKit
+migration passes with and without stalls using actual b77938a code: ready:true,
+zero legacy refresh downloads, one banner/user-triggered reload, N-1 open tab,
+eviction repair, incremental refresh and offline boot. Both rollback flags
+pass offline browser checks. Async polling fixes the Playwright harness race.
+
+Accepted legacy exception: b77938a retains its four-second timer after the USER
+presses Refresh UI and does not report playback. New pages guard playback,
+offer explicit override and post PLAYING; workers defer known-playing requests
+and never call skipWaiting during installation.
+
+Final one-run LTE measurements (`phase2-final-2026-10-07.json`, Chromium/WebKit):
+JS updates 155,648/189,354 bytes versus 611,338/680,822; CSS 31,476/30,545 versus
+611,476/680,831. Sync fetches changed app/style + index/manifest; fonts/icons transfer
+zero bytes. Browser worker checks add overhead: Chromium downloads sw.js twice;
+WebKit also downloads the unchanged imported core. Thus total CSS exceeds
+30,000 bytes.
+
+Cold bytes: 624,762/1,191,130 versus 1,040,158/1,180,749. Chromium transfers app.js
+once; WebKit transfers it twice despite HTTP-cache reuse attempts. Cache sharing
+remains unresolved. Cold boot: 11,155/4,327 ms versus 10,480/3,290; warm:
+671/121 versus 692/139; offline: 264/133 versus 259/137. Single-run cold regressions
+need further investigation; no claim that every performance target was met.
+
+Owner iPhone checks: locked playback, override/cancel, stall recovery, offline
+launch and OPFS/quota coexistence. No push, merge or deployment.