Update Subduction Wasm (for ephemeral message fix)

[expede]

...also ran the formatter

[Copilot]

Pull request overview

Bumps @automerge/automerge-subduction to 0.12.1 and fixes a regression in the Subduction ephemeral message bridge where every message after the first from a sender was dropped by the receiver's dedup logic because count was hard-coded to 0. A per-Repo monotonic counter is now used, and a regression test is added.

Changes:

• Replace hard-coded count: 0 in Repo.ts ephemeral broadcast with an incrementing #subductionEphemeralCount.
• Bump @automerge/automerge-subduction from 0.12.0 to 0.12.1 in root and package manifests + lockfile.
• Add regression test for multiple successive ephemeral broadcasts; reformat existing tests (no behavior change).

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packages/automerge-repo/src/Repo.ts	Replaces hard-coded count: 0 with a per-Repo monotonic counter for outbound ephemeral broadcasts; minor formatting tidy.
packages/automerge-repo/package.json	Bumps subduction dep to 0.12.1.
package.json	Bumps root subduction dep to 0.12.1.
pnpm-lock.yaml	Lockfile updates for 0.12.1.
packages/automerge-repo/test/subduction/WebSocket.test.ts	Adds regression test for multiple successive ephemeral broadcasts from one sender.
packages/automerge-repo/test/subduction/SaveResilience.test.ts	Pure formatting changes (test bodies unchanged).
packages/automerge-repo/test/_repo-perf.test.ts	Pure formatting changes.

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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