Stabilize the remaining timed CI fuzz smoke checks

[kwisatzh]

Summary

Use fixed 10,000-input budgets and a two-minute overall timeout for the three
remaining timed PR/main CI fuzz smoke commands. Keep every target and assertion.
The scheduled security workflow's longer timed fuzzing is unchanged.

Main run 38191882262
failed on macOS in FuzzTraceRecord with context deadline exceeded at the
10-second duration boundary. The session tests, race tests and vet passed;
Ubuntu was cancelled by matrix fail-fast. This matches the timed-fuzz cancellation
failure described in Go #75804,
already referenced by the repository's security workflow.

Checks

• All seven resulting smoke commands passed three consecutive local runs on
  Go 1.26.9, including the failing trace target.
• Race tests and vet passed.
• No runtime, dependency, release-version or test-target changes.

This repair is separate from v0.8.0 preparation so release pins stay held for
approval. No release tags or publication.