[codex] Fix Dirac distribution mode selection

[FlorianPfaff]

Summary

• Fix AbstractDiracDistribution.mode() to select the maximum-weight Dirac with backend argmax instead of unpacking max(self.w).
• Return the selected Dirac location directly so the method works for row-shaped and one-dimensional sample arrays.
• Correct the equally-weighted warning check to compare the maximum weight against the uniform-weight baseline.
• Add a regression test covering a weighted Dirac distribution whose mode should be the highest-weighted sample without warnings.

Validation

• Not run locally; this session has a read-only filesystem, so the change was made through the GitHub connector. CI should run on the PR.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	14.02s
✅ JSON	prettier	2	0	0	0	0.53s
✅ JSON	v8r	2		0	0	2.54s
✅ MARKDOWN	markdownlint	2	0	0	0	0.65s
✅ MARKDOWN	markdown-table-formatter	2	0	0	0	0.25s
✅ PYTHON	bandit	382		0	0	5.38s
✅ PYTHON	black	382	33	0	0	9.34s
✅ PYTHON	flake8	382		0	0	2.87s
✅ PYTHON	isort	382	36	0	0	0.73s
✅ PYTHON	mypy	382		0	0	4.76s
✅ PYTHON	pylint	382		0	0	111.35s
✅ PYTHON	ruff	382	36	0	0	0.08s
✅ REPOSITORY	checkov	yes		no	no	21.05s
✅ REPOSITORY	gitleaks	yes		no	no	9.78s
✅ REPOSITORY	git_diff	yes		no	no	0.06s
✅ REPOSITORY	secretlint	yes		no	no	7.37s
✅ REPOSITORY	syft	yes		no	no	3.39s
✅ REPOSITORY	trivy-sbom	yes		no	no	1.94s
✅ REPOSITORY	trufflehog	yes		no	no	18.73s
✅ YAML	prettier	4	0	0	0	0.44s
✅ YAML	v8r	4		0	0	5.51s
✅ YAML	yamllint	4		0	0	0.39s

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[github-actions]

Test Results

    12 files  +    4      12 suites  +4   4h 32m 23s ⏱️ + 2h 46m 43s
 1 097 tests +    7   1 097 ✅ +    7      0 💤 ±  0  0 ❌ ±0 
13 448 runs  +4 516  10 356 ✅ +3 752  3 092 💤 +764  0 ❌ ±0 

Results for commit ba5837d. ± Comparison against base commit 24543a9.