Prepare 1.0 stability release

[rasuvaeff]

What changed

• freeze the public 1.x compatibility policy and document the core-first family release order
• refresh the committed API workspace lock to the released 0.x satellites
• document the 0.12.0 surface as the 1.0.0 contract

Validation

• composer build
• composer release-check with Docker safe.directory configured
• full mutation gate: 3406 mutants, 2880 killed, 234 escaped, 290 errors, 2 timeouts, MSI above the configured 92% gate

[coderabbitai]

Important

• 🔍 Trigger review

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Run ID: ae7769ce-d1d4-406e-b453-5f0b07fcda55

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