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BB-fat
a4e668542d
Blocking: - B1: delete screenshot scratch PNGs — observation frames reuse one fixed per-session path and unlink after every read (finally); browser_screenshot unlinks once the bytes are in the attachment store (kept only when the file itself is the model-facing artifact). - B2: replicate dsh's browser-trust fence on /bsk-observation/*: loopback Host only, Origin must match Host, sec-fetch-site: cross-site refused, POST requires application/json; README documents the loopback trust premise and the 0.0.0.0 warning. Major: - M1: KeyedExecutor tail chains previous+task (allSettled) so a task aborted while queued cannot release the next one into the running session. - M2: client tracks the live frame per session — replacing/removing/reset revokes the old blob URL at once; loads settling after replacement never resurrect it. Minor: drop replaced thumbRefs (+on remove); beginAction fires inside the queue (no label overwrite while queued, no idle flash); half-initialized session cleanup stops through the queue with one retry; SSE (re)open refetches /state (+ snapshot flag renamed subscribed); install probe uses --version (no daemon spawn); emulate mobile documents the width+height requirement (the daemon refuses it alone — verified). Nit: single BskRunOptions declaration; tails map entry dropped on drain; SSE cleanup on res close; popOut catches requestWindow rejections; resize handle gains keyboard control (arrows, 16px steps, aria value attrs). Tests: +14 (fence rules, scratch lifecycle, queue race, blob revocation, instrumentation timing, SSE resync). 113/113 green.