Assessing package for production readiness

[Copilot]

• Review the last two commits and the new PR comments
• Re-run baseline validation to confirm the starting state
• Restore NewFromSlices fast path for state-space systems while keeping gain-path copy safety
• Trim the README production-readiness section to concise library documentation
• Remove the whitespace-only LFTDelay.Tau formatting change
• Run targeted tests for constructor and delay copy semantics
• Run final review and security checks

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[jamestjsp]

Review

Good changes

1. SetDelay defensive copy — Real bug fix. Stores caller's matrix directly today, so mutations corrupt the system. copyDelayOrNil fix is correct and consistent with New().

2. NewGain defensive copy — Same aliasing bug, correct fix.

3. README Pole → Place — Correct, the function is Place.

4. Aliasing tests — Good coverage for New, NewGain, NewFromSlices, SetDelay, NewWithDelay.

5. doc.go godoc addition — Fine.

Concerns

1. NewFromSlices performance regression — The n>0 path previously used newNoCopy, which was already safe since mat.NewDense(n, m, freshSlice) owns its data. Routing through New() adds an unnecessary denseCopySafe on every matrix (double allocation). The fix is only needed for the n==0/gain path — the n>0 path should stay as newNoCopy.

2. Production Readiness section — Verbose for a library README. The "release checklist" reads more like a blog post than API documentation. Consider moving to a separate PRODUCTION.md or trimming significantly.

3. LFTDelay.Tau alignment change (ss.go) — Cosmetic whitespace-only. Harmless but unnecessary diff noise.

[jamestjsp]

@copilot address the concerns by code reviewer

[Copilot]

Review

Good changes...

Updated in ac01800. NewFromSlices now uses the original fast path for n > 0, the README production-readiness section is trimmed to concise library guidance, the whitespace-only LFTDelay.Tau diff is gone, and the regression coverage is narrowed to the gain-only NewFromSlices path plus the NewGain/SetDelay fixes.

@copilot address the concerns by code reviewer

Addressed in ac01800. The follow-up commit restores the NewFromSlices fast path for state-space systems, keeps the defensive-copy fixes on the gain-only path and delay setter, trims the README section, and revalidates the targeted/full test suite.

[jamestjsp]

All concerns addressed. NewFromSlices keeps newNoCopy for n>0, README trimmed, tests updated correctly. LGTM.