fix api endpoint documentation sync

[thebiglabasky]

Affected Components

• Content & Marketing
• Pricing
• Test
• Docs
• Learn
• Other

Notes for the Reviewer

Fixes the generated API endpoint PR workflow so new endpoint stubs are added to the API Reference tab in docs.json instead of silently skipping navigation.

Also:

• fails the workflow if docs.json cannot be updated
• avoids overwriting existing endpoint pages when summaries collide, such as /v1/check-sessions/* and /v2/check-sessions/*
• allows regeneration after a stale generated PR is closed by using a suffixed branch when the old remote branch still exists
• writes the PR body through --body-file so Markdown code spans are preserved
• adds the closed bulk status-page subscription endpoint to .api-doc-ignore so it does not immediately regenerate

Validation:

• node --check .github/scripts/detect-new-endpoints.mjs
• DRY_RUN=1 node .github/scripts/detect-new-endpoints.mjs

New Dependency Submission

None.

Screenshots

No visual changes.

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Project	Status	Preview	Updated (UTC)
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