chore: remove rhiza benchmark and mutation workflows

[tschm]

Deletes the two rhiza caller workflows:

• .github/workflows/rhiza_benchmark.yml
• .github/workflows/rhiza_mutation.yml

Both are thin stubs that invoke the reusable benchmark/mutation workflows in jebel-quant/rhiza.

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💤 Files selected but had no reviewable changes (2)

• .github/workflows/rhiza_benchmark.yml
• .github/workflows/rhiza_mutation.yml

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Reviewing files that changed from the base of the PR and between 8f4934a and 852afd1.

📒 Files selected for processing (2)

• .github/workflows/rhiza_benchmark.yml
• .github/workflows/rhiza_mutation.yml

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Pull request overview

Removes two GitHub Actions workflow “caller stubs” for Rhiza benchmark and mutation testing, presumably to stop running those checks from this repository and/or reduce workflow surface area.

Changes:

• Deleted .github/workflows/rhiza_benchmark.yml (push-to-main benchmark caller).
• Deleted .github/workflows/rhiza_mutation.yml (PR/schedule/dispatch mutation-testing caller with opt-in gate).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
.github/workflows/rhiza_benchmark.yml	Deletes the Rhiza benchmark caller workflow stub.
.github/workflows/rhiza_mutation.yml	Deletes the Rhiza mutation-testing caller workflow stub.

Comments suppressed due to low confidence (2)

.github/workflows/rhiza_benchmark.yml:1

• These workflow stubs are still tracked by the Rhiza template lock (see .rhiza/template.lock entries for .github/workflows/rhiza_benchmark.yml). If Rhiza sync runs, it will likely re-add this file or flag the repo as out-of-sync. To remove this workflow permanently, also update the Rhiza template configuration (e.g., exclude this path in .rhiza/template.yml or bump the Rhiza ref to a version that no longer includes it) and regenerate template.lock accordingly.
  .github/workflows/rhiza_mutation.yml:1
• This workflow stub is still tracked by the Rhiza template lock (see .rhiza/template.lock entries for .github/workflows/rhiza_mutation.yml). If Rhiza sync runs, it will likely re-add this file or flag the repo as out-of-sync. To remove this workflow permanently, also update the Rhiza template configuration (e.g., exclude this path in .rhiza/template.yml or bump the Rhiza ref to a version that no longer includes it) and regenerate template.lock accordingly.

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