[codex] Fix Poetry extras dependency declarations

[FlorianPfaff]

Summary

• Declare the optional backend packages in the main Poetry dependency table with optional = true.
• Keep the same packages in the dev dependency group so the existing development/test install behavior still includes all backends.
• Leave the existing extras groups wired to those optional dependencies so package installs like pyrecest[jax_support], pyrecest[pytorch_support], and pyrecest[healpy_support] can emit the expected runtime dependency metadata.

Root cause

The extras listed healpy, torch, jax, jaxlib, and autograd, but those packages were only declared under [tool.poetry.group.dev.dependencies]. Dev dependency groups are not package runtime metadata, so the published extras could resolve to empty dependency sets for users installing from PyPI.

Validation

• Verified the branch diff contains only the intended pyproject.toml change.
• Not run locally; this Codex session has a read-only filesystem and cannot regenerate or validate poetry.lock/exported requirements. Before marking ready, run poetry lock and refresh generated requirement exports if the project requires them in the same PR.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	12.42s
✅ JSON	prettier	2	0	0	0	0.45s
✅ JSON	v8r	2		0	0	2.49s
✅ MARKDOWN	markdownlint	2	0	0	0	0.69s
✅ MARKDOWN	markdown-table-formatter	2	0	0	0	0.26s
✅ PYTHON	bandit	382		0	0	5.39s
✅ PYTHON	black	382	33	0	0	9.46s
✅ PYTHON	flake8	382		0	0	2.92s
✅ PYTHON	isort	382	36	0	0	0.73s
✅ PYTHON	mypy	382		0	0	4.82s
✅ PYTHON	pylint	382		0	0	113.97s
✅ PYTHON	ruff	382	36	0	0	0.08s
✅ REPOSITORY	checkov	yes		no	no	22.35s
✅ REPOSITORY	gitleaks	yes		no	no	6.76s
✅ REPOSITORY	git_diff	yes		no	no	0.03s
✅ REPOSITORY	secretlint	yes		no	no	7.33s
✅ REPOSITORY	syft	yes		no	no	6.53s
✅ REPOSITORY	trivy-sbom	yes		no	no	2.96s
✅ REPOSITORY	trufflehog	yes		no	no	18.6s
✅ YAML	prettier	4	0	0	0	0.5s
✅ YAML	v8r	4		0	0	4.55s
✅ YAML	yamllint	4		0	0	0.43s

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[github-actions]

Test Results

    12 files  +    4      12 suites  +4   4h 39m 36s ⏱️ + 2h 53m 56s
 1 106 tests +   16   1 106 ✅ +   16      0 💤 ±  0  0 ❌ ±0 
13 556 runs  +4 624  10 408 ✅ +3 804  3 148 💤 +820  0 ❌ ±0 

Results for commit 1c145f6. ± Comparison against base commit 24543a9.

♻️ This comment has been updated with latest results.