[codex] Add observation-specific multisession costs

[FlorianPfaff]

Summary

Adds a small clean follow-up to PR #1751 that keeps the current main multisession solver intact and ports only the missing observation-specific start/end cost wrapper.

Changes

• Add solve_multisession_assignment_with_observation_costs as a wrapper around the existing multisession solver.
• Export the new helper from pyrecest.utils.
• Add focused tests for uniform-cost equivalence, detection-specific start/end costs, scalar broadcasting, threshold handling, and validation errors.
• Keep Pylint's duplicate-code checker enabled globally; scope the R0801 suppressions to the new wrapper and test modules where the overlap is intentional.

Validation

• Prior CI passed on commit cc05267c02ac26a9f5e20820e0b3edf90c867274 before this follow-up.
• This follow-up removes the global duplicate-code disable from pyproject.toml; GitHub CI should rerun on the latest branch head.
• I could not run the test suite locally from this read-only Codex workspace.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	12.27s
✅ JSON	prettier	2	0	0	0	0.43s
✅ JSON	v8r	2		0	0	2.68s
✅ MARKDOWN	markdownlint	2	0	0	0	0.69s
✅ MARKDOWN	markdown-table-formatter	2	0	0	0	0.22s
✅ PYTHON	bandit	395		0	0	6.08s
✅ PYTHON	black	395	7	0	0	9.64s
✅ PYTHON	flake8	395		0	0	3.47s
✅ PYTHON	isort	395	11	0	0	0.77s
✅ PYTHON	mypy	395		0	0	5.49s
✅ PYTHON	pylint	395		0	0	124.54s
✅ PYTHON	ruff	395	11	0	0	0.08s
✅ REPOSITORY	checkov	yes		no	no	24.81s
✅ REPOSITORY	gitleaks	yes		no	no	7.92s
✅ REPOSITORY	git_diff	yes		no	no	0.03s
✅ REPOSITORY	secretlint	yes		no	no	7.86s
✅ REPOSITORY	syft	yes		no	no	3.22s
✅ REPOSITORY	trivy-sbom	yes		no	no	2.33s
✅ REPOSITORY	trufflehog	yes		no	no	19.88s
✅ YAML	prettier	4	0	0	0	0.48s
✅ YAML	v8r	4		0	0	5.12s
✅ YAML	yamllint	4		0	0	0.45s

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[github-actions]

Test Results

    12 files  +    12      12 suites  +12   4h 49m 20s ⏱️ + 4h 49m 20s
 1 139 tests + 1 139   1 139 ✅ + 1 139      0 💤 ±    0  0 ❌ ±0 
13 960 runs  +13 960  10 672 ✅ +10 672  3 288 💤 +3 288  0 ❌ ±0 

Results for commit bf295f6. ± Comparison against base commit d91eaeb.

♻️ This comment has been updated with latest results.