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.
