[codex] Fix summarize run count warning

[FlorianPfaff]

Summary

• Check the run axis when warning about fewer than 1000 runs in summarize_filter_results.
• Add a regression test covering 1000 runs with only two timesteps, which used to warn incorrectly.

Validation

• Not run locally; this session has no writable local checkout. Verified the GitHub compare shows only the intended source and test files changed.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	12.2s
✅ JSON	prettier	2	0	0	0	0.39s
✅ JSON	v8r	2		0	0	2.87s
✅ MARKDOWN	markdownlint	2	0	0	0	0.58s
✅ MARKDOWN	markdown-table-formatter	2	0	0	0	0.18s
✅ PYTHON	bandit	386		0	0	5.2s
✅ PYTHON	black	386	3	0	0	8.5s
✅ PYTHON	flake8	386		0	0	3.02s
✅ PYTHON	isort	386	4	0	0	0.62s
✅ PYTHON	mypy	386		0	0	4.43s
✅ PYTHON	pylint	386		0	0	106.63s
✅ PYTHON	ruff	386	4	0	0	0.06s
✅ REPOSITORY	checkov	yes		no	no	20.66s
✅ REPOSITORY	gitleaks	yes		no	no	6.53s
✅ REPOSITORY	git_diff	yes		no	no	0.02s
✅ REPOSITORY	secretlint	yes		no	no	6.77s
✅ REPOSITORY	syft	yes		no	no	5.92s
✅ REPOSITORY	trivy-sbom	yes		no	no	2.68s
✅ REPOSITORY	trufflehog	yes		no	no	18.38s
✅ YAML	prettier	4	0	0	0	0.39s
✅ YAML	v8r	4		0	0	4.73s
✅ YAML	yamllint	4		0	0	0.4s

See detailed reports in MegaLinter artifacts

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[github-actions]

Test Results

    12 files  +    12      12 suites  +12   4h 26m 55s ⏱️ + 4h 26m 55s
 1 104 tests + 1 104   1 104 ✅ + 1 104      0 💤 ±    0  0 ❌ ±0 
13 532 runs  +13 532  10 392 ✅ +10 392  3 140 💤 +3 140  0 ❌ ±0 

Results for commit fb179ed. ± Comparison against base commit 8e27cb5.

♻️ This comment has been updated with latest results.