docs(coil): fix seam-ledger rows the #71 rename left pointing at t3x names

[radroid]

Four rows in docs/coil/SEAMS.md still described the update-delivery seam using its pre-rename
identifiers. None of them exist in the tree any more:

Row	Claimed	Actually
packages/contracts/src/ipc.ts	t3xUpdate, src/t3x/updateDelivery.ts	coilUpdate, src/coil/updateDelivery.ts
apps/desktop/src/preload.ts	t3xUpdate bridge object	coilUpdate
apps/desktop/src/ipc/channels.ts	four t3x:update-* constants	coil:update-*
apps/desktop/src/ipc/DesktopIpcHandlers.ts	three t3xUpdate handlers	coilUpdate handlers, now named

The ledger is the fork's map of its own upstream surface. A row naming a symbol that no longer
exists is worse than no row at all, because it reads as verified.

Deliberately not a blanket rename. scripts/t3x/**, .github/workflows/t3x-*.yml and the
t3x-sync label all kept the old name through #71, and line 49's note about the rename itself is
correct history. Only the source namespaces and docs moved, so t3x in a path is not automatically
stale.

Every identifier the file now claims was grepped against the tree before committing: coilUpdate,
coil/updateDelivery.ts, coil:update-state, getCoilUpdateState, restartIntoUpdate,
dismissCoilUpdate — all present.

Header total

Also corrects +2621 to +2622. Regenerated against origin/main per the file's own Regenerating
section (merge-base 196c8ea0d, matching the header; HEAD == origin/main): 51 files,
+2622 / -1093. File count and deletions were already right.

That is the third time these totals have been wrong when checked — +1616 against a real +1627
on 2026-08-05, now this. The file's instruction to regenerate before trusting it keeps being
correct.

Verification

Docs-only; no code paths touched. vp fmt ran clean via the pre-commit hook.

Model: Claude Opus 5 (1M context). Harness: Claude Code.

🤖 Generated with Claude Code

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