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Jinwoo Hong
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* feat(mobile): carry screencast frames over the bridge as base64 (OTA phase C, C6.1) `bridge-screencast-binary.ts` landed in C0 as the page's half of the binary lane and named C6 as the owner of the encoder that satisfies it. This is that encoder, plus the host honouring `wantsBinary`: a subscribe that asked for binary gets an `onBinaryFrame` on the native stream, and each frame crosses as the envelope's `event.binary` on the same `seq` ledger as the stream's JSON events, because the page acks by that count. The base64 encoder is grouped rather than per byte or per `fromCharCode` window. Its docstring carries the measurement, including the part that contradicts the design note this came from: on V8 the per-byte form is the fastest of the three, not the quadratic one, and the chunked form it was meant to beat is the slowest. The grouped one is here because its cost does not depend on how an engine ropes `+=`, and Hermes is what the shell runs. No new opcode, no `v` bump, no negotiation added: `wantsBinary` is already in the contract and is the negotiation. Over-cap behaviour is unchanged in this commit — a binary event over the frame cap still ends the stream, which is what C6.2 changes. Claude-Session: https://claude.ai/code/session_01JNnE9qzUZMMnqpZWCqM3nb * feat(mobile): drop an over-cap screencast frame instead of ending the stream (OTA phase C, C6.1) Measured at the pane's own request parameters, a screencast frame exceeds the 640 KiB envelope on a phone layout whenever the page will not compress: JPEG's worst case is 0.545 bytes per pixel at quality 72, so mobile view mode at 780x1424 is 811,289 bytes, 124% of the cap. Ending the stream there blacks out a browser tab for the life of the pane over one frame. So the two kinds of event part at the cap. A JSON event that will not fit still ends the stream with `overflow`, because its reader cannot see the hole it would leave; a screencast frame is dropped and the stream lives, because the next frame is one throttle interval away and the pane is still showing the last one. Both are asserted side by side so neither turns into the other. A drop leaves no other trace: the diagnostic beside it prints once per host, so a stream shedding a frame a second and one that shed a single frame read the same. The host therefore counts them per stream for the diagnostic and keeps a session total, and the shell's dev facts carry that total — the surface that already shows build state, with the line moved into its own module so what it says is pinned rather than inferred from a template. The 12-character build prefix it has always shown is unchanged. Claude-Session: https://claude.ai/code/session_01JNnE9qzUZMMnqpZWCqM3nb * feat(mobile): name the binary screencast lane as a grant (OTA phase C, C6.1) Ruling 5's negotiation, and the check it asked for first: no reader of a grant is a closed enum, so there is no blocker and nothing an older page has to tolerate. `BridgeGrantsSchema.native` and the shell's manifest reader are both open string arrays, and the shell reader's own docstring already states the degradation — a grant name a build does not know leaves that one route native rather than refusing the bundle. What does constrain the name is the host contract's `GRANT_NAME_PATTERN`: a grant is one camelCase token or a `native.<domain>.<action>` verb with at least two dot segments. So `browser.screencast` and `native.screencast` are both refused, and the lane is `screencastBinary`. `screencast` alone would be wrong: the page can already subscribe to `browser.screencast` and receive its JSON events, and only the binary frames need the encoder. Added to the shell's implemented set, which is the same list `init.grants.native ` offers, so a route declaring it is served by a shell that has the encoder and left native by one that does not. No route declares it here; C7's session route does. The contract-side case is a characterisation pin, not a red-first one: the pattern already admitted this name, and the test records that the two tempting spellings are the ones it refuses. Claude-Session: https://claude.ai/code/session_01JNnE9qzUZMMnqpZWCqM3nb * test(mobile): check the dropped-frame total through the bridge hook (OTA phase C, C6.1) The hook gained a required `onBinaryFramesDropped` two commits ago and this test kept calling it without one, so the tests-typecheck ratchet went red on that commit — caught here rather than in CI because an exit code was read off a pipeline's last stage instead of the script. Fixed by wiring the callback into the probe rather than by a cast, and with the case that makes the wiring evidence instead of types: a dropped frame raises the total the screen receives, and the stream stays subscribed while it does. Claude-Session: https://claude.ai/code/session_01JNnE9qzUZMMnqpZWCqM3nb * refactor(mobile): keep the dropped-frame counter with the ledger it belongs to (OTA phase C, C6.1) Declared between a getter and a method, which is not where this class keeps state: the subscription map is at the top and the counter is the same kind of thing. Move only. Claude-Session: https://claude.ai/code/session_01JNnE9qzUZMMnqpZWCqM3nb * fix(mobile): serve the binary screencast lane only to a route granted it (OTA phase C, C6.1) Reported as a gap after C6.1's third commit and ruled on: the host honoured `wantsBinary` from any page, so a route that never declared `screencastBinary` could still make the shell encode base64 on its behalf. That is the hole per-route grants exist to close — the same class as a route granted only `navigate` and `storage` reaching the clipboard. The rule now reads the session's resolved list, which is what its route declared narrowed to what this shell implements, and is the same set `init.grants.native` is built from. So the host offers the lane in `init` exactly when it will serve it. Ungranted is not a refusal. The subscription proceeds and its JSON events cross as before, which is the silence every other grant gives at the call site; a page that reads its own grants never reaches that state. Both branches are pinned beside each other, and `grantsForRoute` is pinned dropping a grant this shell does not implement — granted-but-unimplemented and never-granted arrive at the host as the same absence, so its rule reads one case. The grant name moves into the module that holds the rule reading it, so the two cannot drift. `bridge-host.ts` is at 298 of its 300-line cap after this. Claude-Session: https://claude.ai/code/session_01JNnE9qzUZMMnqpZWCqM3nb * refactor(mobile): move the page's stream-frame rules out of the host (OTA phase C, C6.1) `bridge-host.ts` reached 298 of its 300-line cap, so the next main merge that touched it would have crossed under CI pressure on someone else's PR. Split deliberately instead, at the boundary the growth came from. `bridge-host.ts` is the host's lifecycle and its dispatch. Opening a stream is the only frame kind whose handling is more than one line of delegation — four refusals and, since C6.1, the binary-lane decision — so it moves whole, and `cancel` and `ack` move with it so all three stream frames are decided in one place. The host's `cancel` arm still chooses between a stream and a request where it always did: a page's `cancel` names one or the other, and splitting that choice would leave half an arm in each module. Counted without blank lines or comments, as the rule counts them: bridge-host.ts 298 -> 270, and the new module is 59. A pure move. No test changed and none was added, which is what makes the existing suites the proof: 45 files and 745 tests green on the same assertions as before. Claude-Session: https://claude.ai/code/session_01JNnE9qzUZMMnqpZWCqM3nb * feat(mobile): report a page that asked for screencast frames it was not granted (OTA phase C, C6.1) An ungranted `wantsBinary` is not a refusal on the wire, so nothing crosses back: the subscription proceeds and its JSON events cross as they always have. That left a page which did ask getting JSON for the life of the document with no side able to say why. `notify-refused` has covered the equivalent notify case since C0; this is the same shape for the one frame kind that lacked it. The rule now answers a verdict rather than a boolean, because `not-asked` and `ungranted` are the same answer for different reasons and only one is worth reporting. So the decision and the report read one rule, and a page that never asked stays silent — pinned, along with a granted route staying silent, so the line cannot start firing on either. The wire is unchanged and pinned unchanged: the case beside this one still asserts one JSON event delivered and zero error frames. Claude-Session: https://claude.ai/code/session_01JNnE9qzUZMMnqpZWCqM3nb * fix(mobile): reset the dropped-frame total with the host that counts it (OTA phase C, C6.1) Round 1 on #21758, three findings. The real one: the count is per host and the screen's copy was not. A rebuilt host starts its own total at zero, so the screen kept the retired host's number until the new one dropped a frame and then read *lower* — a falling count looks like frames coming back, which is worse than starting over. The hook now announces a fresh count as it builds a host. That also reports zero on the first build, where the screen is already at zero and React bails out of the render; the two hook cases pin that leading zero rather than leave it to be rediscovered. Two docstrings that described nothing: `BUILD_ID_PREFIX_LENGTH`'s stayed behind when the constant moved to the dev-facts module and had drifted above `failureMessage`, and `page-route-policy.test.ts` kept the docstring of the test it replaced above the one that replaced it. Both deleted; the first's text lives on the new module. Red-first for the reset, checked against its final expectations rather than its first: with the one line reverted both hook cases fail on the missing zero, and both pass with it. Claude-Session: https://claude.ai/code/session_01JNnE9qzUZMMnqpZWCqM3nb * fix(mobile): keep the dropped-frame total out of a production build's render path (OTA phase C, C6.1) CodeRabbit's Major on #21758. The total went into React state on every dropped frame in every build, and outside a development build the line that reads it renders null — so an over-cap page re-rendered the whole shell screen up to ten times a second for a fact nobody can see. Measured, not argued: five drops, five extra renders. Fixed at the seam rather than with a ternary at the call site. The dev-facts module owns the line, so it now owns the number behind it and the rule that the number is only state where something renders it. The screen holds no flag and no counter; it asks for both and passes the reporter on. The reporter is stable, so the bridge host is never rebuilt for it. `isDevelopmentBuild` becomes a call rather than a module constant. A build flag never changes at runtime so this costs nothing, and as a constant the branch was unreachable to anything that did not set the global before the module loaded — which is why the production case could not be written at the screen at all. Also fixed, found while writing that case: the screen test's `usePageHostSnapshot` double returned a fresh object on every render, so the host effect's identity changed each time and the bridge host was torn down and rebuilt on every render of the screen, settling every pending request with it. The real hook holds the snapshot in `useState` and is stable. One object for the file now. This was masking the fold under test — the count reset to zero on every render — and every other case in that file was measuring a rebuild storm. Claude-Session: https://claude.ai/code/session_01JNnE9qzUZMMnqpZWCqM3nb * perf(mobile): price a screencast frame before encoding it (OTA phase C, C6.1) Round 2 on #21758, two lows. The encode is a base64 pass over the whole image and the window decides whether the frame can be posted at all, so deciding after encoding made a page that had stopped acking pay for every frame the shell then threw away — the reviewer's case is ten 300 KB frames against a closed window, 3 MB encoded and nothing sent. The size is knowable without encoding: base64 is ASCII, so JSON escapes none of it and the frame is its header serialized plus exactly the image's encoded length. `encodeBridgeScreencastFrame` is now built from that header rather than beside it, so the shape measured and the shape sent cannot drift, and the window arithmetic is one rule read before the encode and again on the frame that was. Exact, not conservative, so the drop diagnostic still reports the whole frame and the committed byte pin is untouched. Red-first with the real encoder wrapped in a counter: window full, ten frames, ten encodes before and zero after, with the drop count still ten. An over-cap frame likewise goes from one encode to none. A third case holds the other direction — two carryable frames still encode twice — so the fix cannot pass by encoding nothing. Second low: the dev-facts block sat outside the only `beforeEach` and left `routeGrants` and `client` mutated, inert only because it runs last. The shared setup moves to file level where the mutable dependencies actually live, resets both, and a case at the end of the file pins it — deleting the reset fails there and nowhere else, since nothing else runs after a case that mutates them. Claude-Session: https://claude.ai/code/session_01JNnE9qzUZMMnqpZWCqM3nb