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fix(signals): a display-ahead mount is born held for fragment, text and function children (#4806) (#4816)

* fix(signals): a display-ahead mount is born held with any child shape (#4806) [wip]

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0117BoWNSSgtemsSYsaX2hXE

* fix(signals): a display-ahead mount is born held for fragment, mixed-text and function children (#4806)

S-46 / S-58 case 1: the branch a display-ahead gate opens is born held, so
the fallback stays while the opening write is held.

- A memo mount (a fragment or text beside a hole: a memo the gate's pass
  returns) holds the gate again, as before #4720, while a render effect
  that is not behind a fallback reads it; one only a memo reads (a
  boundary built around it, #3851) does not.
- A function child mounts under the slot's render effect: a render effect
  that reads a verdict memo this pass stamps the mount it creates.

Text content read in the gate's own pass stays open (pinned it.fails).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0117BoWNSSgtemsSYsaX2hXE

* test(web): give the #4806 function child a parameter (Show's NonZeroParams type)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0117BoWNSSgtemsSYsaX2hXE

* fix(signals): text content a display-ahead gate opens is a mount too (#4806)

Ruled 2026-11-12: a plain-text child counts as a mount, and fragment vs
element never changes the result. A verdict-lane pass that reads a staging
it did not read on its last pass holds its lane while the hold waits, as a
born-held element mount does. D-25 narrowed; S-46/S-58 prose updated.
Also moves creatorPass's doc comment back above it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0117BoWNSSgtemsSYsaX2hXE

* fix(signals): reset the #4806 fresh mark on every read, un... (continued)

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