test: cover adaptive spread edge cases

[Genmin]

What

Add dedicated unit coverage for adaptive spread quote generation, including min/max spread clipping, neutral inventory symmetry, long/short inventory skew direction, and sampled bid-mid-ask invariants.

Why

compute_adaptive_quotes is a core quoting primitive. These edge cases make sure volatility clipping and inventory skew keep producing sane executable quotes across the cases requested in #28.

Fixes #28

How to Test

• python3 -m venv .venv && . .venv/bin/activate && python -m pip install -r requirements.txt
• python -m pytest tests/unit/test_adaptive_spread.py -q
• python -m pytest tests/unit -q
• python -m pytest -q

Checklist

• Tests pass (116 passed, 2 skipped locally)
• Docs updated if API changed (N/A; tests only)

[abhicris]

Welcome to kcolbchain, @Genmin — glad you're here. 🌱

Here's what happens from this PR:

1. Our automated review looks for obvious issues (tests, secrets, size) within a couple of hours.
2. If it's clean and CI passes, we merge without back-and-forth.
3. If we need changes, we'll leave a specific comment — not a generic nit. Push another commit and we re-review.

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• Run the repo's tests locally (see the repo README.md).
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Thanks for writing the code. We're building this to last.

[abhicris]

🤖 Audit verdict: safe

New test file with standard pytest unit tests for adaptive spread logic; no malicious payloads, supply-chain risk, credential leakage, or logic bugs detected.

Audited by the kcolbchain PR pipeline. See pipeline docs.