tmp: deliberate break, do not merge (mutants gate)

[auxesis]

Throwaway. Do not review or merge; it will be closed and its branch deleted shortly.

Plan §1.2 deliberate-break check for PR C (#1003): mutants.yml runs --in-diff and posts its sticky comment only on a pull request, so this draft PR exists to exercise it. The one commit adds an untested pub fn mutants_probe(x: u8) -> bool { x > 3 } to packages/stack-auth/src/lib.rs; the expected result is the Enforce step failing with 5 missed mutants. The other workflows this PR triggers are cancelled.

🤖 Generated with Claude Code

https://claude.ai/code/session_01PaY5xYydZUWhv8Nex9Sw8a

[changeset-bot]

⚠️ No Changeset found

Latest commit: 500ae5b

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[github-actions]

Mutation testing (cargo-mutants, --in-diff, stack-auth + stack-encrypt)

caught	missed	unviable	timeout
0	5	0	0

Surviving mutants: add a test that fails on each before merging

packages/stack-auth/src/lib.rs:160:5: replace mutants_probe -> bool with true
packages/stack-auth/src/lib.rs:160:5: replace mutants_probe -> bool with false
packages/stack-auth/src/lib.rs:160:7: replace > with == in mutants_probe
packages/stack-auth/src/lib.rs:160:7: replace > with < in mutants_probe
packages/stack-auth/src/lib.rs:160:7: replace > with >= in mutants_probe

[auxesis]

Deliberate-break run finished (Mutants gate failed as expected: 5 missed). Closing; the branch is deleted next.