CON-1513/CON-1515: Auto-generate Host Self-Test Reference docs

[jjziets]

Summary

• add a generated Host Verification / Self-test Reference page
• add a docs generator that reads Vast CLI diagnostics and self-test runtime metadata
• wire the generated page into Host docs navigation and link it from existing self-test guidance
• add a docs workflow that regenerates the page and fails when committed MDX is out of sync

Jira

• CON-1515: Host Docs: Verification / Self-test Reference
• CON-1513: Self-Test: Auto-generate Verification docs from Self-Test code
• Epic: CON-1187

Supporting Source PRs

• CON-1519: add self-test diagnostic support bundles vast-cli#410
• vast-ai/self-test#2

Validation

• PYTHONDONTWRITEBYTECODE=1 npm run generate-self-test-reference -- --vast-cli ../vast-cli-main-validate --self-test ../self-test-main-validate
• python3 -m py_compile scripts/generate_self_test_reference.py
• git diff --check
• verified no __pycache__ / .pyc artifacts remain
• local preview: http://localhost:3001/host/self-test-reference

npx mint validate still fails on the existing unrelated guides/teams/overview navigation warning.

Note: this PR is currently from a fork because the local GitHub token cannot push branches directly to vast-ai/docs. Fork PRs cannot access the private VAST_DOCS_SOURCE_TOKEN, so the workflow skips private source checkout in that case. The full sync check still runs for upstream branches, manual workflow runs, and repository dispatch events.