Add streamlined engineering voice preset

[theclaymethod]

What changed

• Add /unslop ste100 as a fifth top-level command.
• Add a pre-built ste100 engineering voice preset for concise technical and teaching copy.
• Preserve approved terms of art while requiring explicit actors, conditions, actions, and outcomes.
• Add routing, schema, benchmark, and ablation coverage for the new mode.
• Describe the mode as ASD-STE100-style guidance without claiming formal compliance.

Why

Users need a reusable voice that is more streamlined than a personal mimic profile: calm, direct engineering communication that remains readable for cross-functional audiences.

Validation

Passed:

• command router parity
• eval schema validation
• shared benchmark generation and freshness check
• taboo catalog parity
• strict benchmark leakage validation
• git diff --check
• all individual script cases in the adversarial suite (with the existing documented XFAIL)

Known validation limitations:

• The adversarial suite process exits nonzero in its fallback audit because the existing harness calls .buffer on StringIO.
• The behavioral matrix cannot run because this environment has Claude subscription access disabled; it fails before producing model output.