fix(selur-compose): recover poisoned mock locks

[hyperpolymath]

Outcome

Closes the one still-reproducible high/error Hypatia source finding from Burble’s stale alert set:

• replaces every Mutex::lock().unwrap() in the selur-compose test driver with a typed helper that recovers poisoned fixture state
• repairs invalid shell-style # comments in two Rust modules; these made the selur-compose workspace fail to parse before tests could run
• removes the resulting unused-mut warning
• formats the three touched Rust modules

The old SSL-verification and unsafe-term findings are already fixed on current main; their referenced source path is gone or uses binary_to_term(..., [:safe]). The neural-state @bitCast operations are intentional fixed-width float/integer serialization, not pointer reinterpretation. The credential findings are documentation/module-name false positives rather than embedded values.

Verification

• cargo test --manifest-path tools/selur-compose/Cargo.toml -p selur-compose-driver: 46/46 unit tests passed
• doc tests: 2 passed, 1 intentionally ignored
• git diff --check: pass

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[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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🟢 Metrics 0 duplication

Metric	Results
Duplication	0

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_{TIP This summary will be updated as you push new changes.}