Add named pairwise association feature schema

[FlorianPfaff]

Adds a generic named-feature convenience layer around the existing LogisticPairwiseAssociationModel.

Changes:

• Adds NamedPairwiseFeatureSchema, pairwise_feature_tensor, and CalibratedPairwiseAssociationModel.
• Keeps derived feature semantics generic via explicit transforms.
• Exports the new helpers from pyrecest.utils.
• Adds tests for tensor construction, finite-value sanitization, schema validation, and calibrated probability/cost conversion.

This intentionally keeps Track2p/Suite2p/ROI-specific defaults and feature semantics downstream in BayesCaTrack.

[github-actions]

Test Results

     8 files  +     8       8 suites  +8   1h 14m 53s ⏱️ + 1h 14m 53s
 1 500 tests + 1 500   1 499 ✅ + 1 499      1 💤 +    1  0 ❌ ±0 
12 368 runs  +12 368  11 336 ✅ +11 336  1 032 💤 +1 032  0 ❌ ±0 

Results for commit 6b8d1e7. ± Comparison against base commit beeb334.

♻️ This comment has been updated with latest results.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	35.36s
✅ JSON	prettier	2	0	0	0	0.57s
✅ JSON	v8r	2		0	0	2.94s
✅ MARKDOWN	markdownlint	28	0	0	0	1.41s
✅ MARKDOWN	markdown-table-formatter	28	0	0	0	0.41s
✅ PYTHON	bandit	508		0	0	8.65s
✅ PYTHON	black	508	2	0	0	13.29s
✅ PYTHON	flake8	508		0	0	4.72s
✅ PYTHON	isort	508	2	0	0	0.97s
✅ PYTHON	mypy	508		0	0	6.95s
✅ PYTHON	pylint	508		0	0	122.77s
✅ PYTHON	ruff	508	2	0	0	0.09s
✅ REPOSITORY	checkov	yes		no	no	23.51s
✅ REPOSITORY	gitleaks	yes		no	no	7.4s
✅ REPOSITORY	git_diff	yes		no	no	0.05s
✅ REPOSITORY	secretlint	yes		no	no	9.5s
✅ REPOSITORY	syft	yes		no	no	3.66s
✅ REPOSITORY	trivy-sbom	yes		no	no	3.69s
✅ REPOSITORY	trufflehog	yes		no	no	22.49s
✅ YAML	prettier	5	0	0	0	0.57s
✅ YAML	v8r	5		0	0	6.04s
✅ YAML	yamllint	5		0	0	0.59s

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