[codex] Audit Logfire docs against implementation

[strawgate]

Summary

• fan in the docs-audit workstreams across public Logfire docs and private platform behavior
• update stale UI labels, API scopes, regional API hosts, OFREP examples, dataset/eval behavior, alert/public-trace flows, SSO wording, and collector snippets
• keep the managed-variables clarifications for latest and Code default from the pilot audit

Verification

• make lint
• git diff --check
• uv run pytest tests/test_docs.py::test_formatting --maxfail=1
• uv run pytest tests/test_docs.py::test_runnable --maxfail=1 (fails on pre-existing docs/concepts.md:48-65 timeout importing pandas/numpy under the 3s pytest-timeout)
• uv run mkdocs build --strict (not available in this repo env: mkdocs executable missing; docs are built by unified-docs)

[cubic-dev-ai]

No issues found across 4 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Re-trigger cubic}