Update licensing to PolyForm Noncommercial

[dfeen87]

Replaced the MIT License with PolyForm Noncommercial License 1.0.0, updated headers in all source python files, updated README.md and other spec and citation files, and verified that everything works perfectly.

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PR created automatically by Jules for task 2271775356130476097 started by @dfeen87

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[Copilot]

Pull request overview

This PR updates the project’s licensing from MIT to PolyForm Noncommercial 1.0.0 and propagates that change across repository metadata and file headers.

Changes:

• Replaced LICENSE contents and updated license references in README.md, CITATION.cff, and api/openapi.yaml.
• Added a PolyForm Noncommercial license header comment to Python source and test files.
• Updated README wording to reflect “source-available / non-commercial” usage terms.

Reviewed changes

Copilot reviewed 32 out of 32 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tools/schema_linter.py	Adds PolyForm Noncommercial license header comment.
tools/migration_helper.py	Adds PolyForm Noncommercial license header comment.
tests/test_validation.py	Adds PolyForm Noncommercial license header comment.
tests/test_security_robustness.py	Adds PolyForm Noncommercial license header comment.
tests/test_schema.py	Adds PolyForm Noncommercial license header comment.
tests/test_query.py	Adds PolyForm Noncommercial license header comment.
tests/test_api.py	Adds PolyForm Noncommercial license header comment.
tests/run_tests.py	Adds PolyForm Noncommercial license header comment (after shebang).
tests/api/test_endpoints.py	Adds PolyForm Noncommercial license header comment.
tests/init.py	Adds PolyForm Noncommercial license header comment.
README.md	Updates license badge/text and license section to PolyForm Noncommercial.
query/query_builder.py	Adds PolyForm Noncommercial license header comment.
query/predicates.py	Adds PolyForm Noncommercial license header comment.
query/filters.py	Adds PolyForm Noncommercial license header comment.
query/explain.py	Adds PolyForm Noncommercial license header comment.
query/init.py	Adds PolyForm Noncommercial license header comment.
LICENSE	Replaces MIT with PolyForm Noncommercial license text.
indexer/serialize.py	Adds PolyForm Noncommercial license header comment.
indexer/index_text.py	Adds PolyForm Noncommercial license header comment.
indexer/adapters.py	Adds PolyForm Noncommercial license header comment.
indexer/init.py	Adds PolyForm Noncommercial license header comment.
core/validate.py	Adds PolyForm Noncommercial license header comment.
core/normalize.py	Adds PolyForm Noncommercial license header comment.
core/errors.py	Adds PolyForm Noncommercial license header comment.
core/descriptor.py	Adds PolyForm Noncommercial license header comment.
core/init.py	Adds PolyForm Noncommercial license header comment.
CITATION.cff	Updates declared license value.
api/storage.py	Adds PolyForm Noncommercial license header comment.
api/openapi.yaml	Updates OpenAPI license name/url.
api/main.py	Adds PolyForm Noncommercial license header comment.
api/embeddings.py	Adds PolyForm Noncommercial license header comment.
api/config.py	Adds PolyForm Noncommercial license header comment.

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