docs: record transactional rebuild candidate contract

[jeonghun-jj-lee]

Summary

• Record the staged VSIX candidate and watchdog adoption contract for Self-provisioning developer rebuilds across supported hosts #1016.
• Define the rebuild terms in the repository glossary.
• Bind Main rebuild source selection to Automate verified overlay promotions from local/amicode #1010's promoted manifest SHA.

Validation

• git diff --check origin/main...HEAD
• pnpm --filter amicode test -- naming_records

Refs #1016
Depends on #1010

[coderabbitai]

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