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docs(signals): async rules — the 2026-10-09/10 rulings in F/D (#3976)

* docs(signals): carry the 2026-10-09 async rulings into the rules

- Holds: only a render effect whose read throws NotReadyError holds a
  change; a served stale value or a verdict read does not.
- Fresh and re-armed boundaries (#3540 stands): a new or re-armed Loading
  catches every NotReadyError under it, and its fallback lands with the
  frame that armed it. A separate change shows the fallback now; only a
  hold on that frame hides it. The draft that hid it for any outside
  reader of the same value is withdrawn.
- An uncaught first load or born-held read in a branch a change mounts
  holds that change; the branch never attaches with an empty slot.
  Loading is how a change escapes the hold. The direction rule's time
  half (once F-8) stays withdrawn.
- Verdicts: a node with a committed value is judged wherever its readers
  are. A node with none (a first load, a memo born held) is loading and
  has no verdict: isPending throws like its read when owned, false
  unowned; latest returns a born-held memo's pending value.
- Scenarios S-3, S-5, S-6, S-14, S-26 corrected; Q-1..Q-5 removed from
  OPEN-QUESTIONS now that the rules carry them.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LVm3wseHt9wRTY8LfPiHmQ

* docs(signals): carry the carve results into the rules

F-6: a probe alone holds nothing; a plain read beside it holds (#3442).
D-4: membership is the reading render effect's; an unread memo holds
nothing (#3802). D-16: the plain-read exception. D-2/D-12/D-13/D-23 and
U-1-U-3: status for carve/born-in-col2, carve/probe-not-holder and
carve/reader-position; the D-13 gap's outside-reader form.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LVm3wseHt9wRTY8LfPiHmQ

* docs(signals): a node a hold's fetch waits on is that hold's work (D-25, #3884)

D-23 points to i... (continued)

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