docs: add API reference pages for 5 undocumented endpoints

[miliberlin]

Summary

An audit of api-reference/openapi.json against the rendered public API reference found 5 spec operations with no documentation page — they were defined in the OpenAPI spec but never surfaced in the docs site.

Method	Endpoint	Nav group
POST	/v1/test-sessions/trigger	Test Sessions
GET	/v1/test-sessions/{testSessionId}	Test Sessions
GET	/v1/test-sessions/{testSessionId}/completion	Test Sessions
GET	/v1/error-groups	Error Groups
POST	/v1/status-pages/{statusPageId}/subscriptions/bulk	Status Page Subscribers

3 of the 4 /v1/test-sessions/* endpoints were missing — only cancel-a-test-session existed.

Changes

• Added an MDX page for each endpoint, using minimal openapi: frontmatter to match the ~160 existing API reference pages.
• Wired the new pages into the Test Sessions, Error Groups, and Status Page Subscribers nav groups in docs.json. Test Sessions is now ordered trigger → retrieve → completion → cancel, matching the Check Sessions group.

Verification

• docs.json is valid JSON.
• Final audit: 167 spec operations / 167 MDX pages / 0 undocumented, no orphaned pages or broken nav links.

🤖 Generated with Claude Code

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[miliberlin]

@sorccu @shiini2 @tnolet let me know if there is any reason for withholding these recently added endpoints from our public API docs, otherwise I'll merge this on Monday. We can also add additional information if needed.

[tnolet]

@miliberlin No specific reason to not add the GET /error-groups/. It think this was an oversight as this used to all be automated, but now it requires manual work to add them to the docs

[miliberlin]

@tnolet thanks for the quick confirmation! There is indeed a workflow that creates a PR but then tags nobody as reviewers nor auto-updates. That needs to be improved. I'm trying to clean up and then will see if I can automate this again.