docs: add CONTRIBUTING.md and data-source contribution guides#2705

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docs/contributing-extensibility

Commits on May 14, 2026

docs: add CONTRIBUTING.md and data-source contribution guides

m1n0
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claude
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Commits on May 15, 2026

docs: address review feedback on contributing guides

m1n0
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claude
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docs: fix failure-mode table entry to match plugin-discovery model

m1n0
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claude
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Commits on May 21, 2026

docs: add research checklist and base-class caveats to data-source guides

paulteehan
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claude
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