astro(feat[parity]): Add Symbol schema export and Pydantic↔Zod parity #448

Job	Run time
qa (3.14)	43s
qa (3.10)	38s
qa (3.13)	30s
qa (3.11)	32s
qa (3.12)	36s
packages	26s
docs	26s
smoke (sphinx-autodoc-sphinx)	9s
smoke (root-install)	10s
smoke (sphinx-gp-theme)	18s
smoke (gp-sphinx)	21s
smoke (sphinx-autodoc-fastmcp)	17s
smoke (sphinx-autodoc-api-style)	16s
smoke (sphinx-ux-badges)	12s
smoke (sphinx-autodoc-typehints-gp)	16s
smoke (sphinx-autodoc-pytest-fixtures)	15s
smoke (sphinx-autodoc-docutils)	10s
smoke (sphinx-autodoc-argparse)	9s
smoke (sphinx-ux-autodoc-layout)	12s
smoke (sphinx-fonts)	8s
	6m 44s

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