MCP experiment tools ship; actionable error messages for…

What's Changed

fix(api): actionable error messages for frequent MCP tool failures by @wochinge in https://github.com/langfuse/langfuse/pull/14832
fix(evals): fail closed on internal eval targets at eval execution time by @hassiebp in https://github.com/langfuse/langfuse/pull/14835
fix(widgets): don't smooth charts across no-data buckets (LFE-10694) by @nkabardin in https://github.com/langfuse/langfuse/pull/14822
fix(blobstorage): hide no-op trace_context group and single-option export source selector by @niklassemmler in https://github.com/langfuse/langfuse/pull/14833
fix(widgets): polish charts — stable tooltips, vertical grid lines, auto legends (LFE-10576) by @nkabardin in https://github.com/langfuse/langfuse/pull/14848
fix(llm): forward caller abort signal in secureLlmFetch by @hassiebp in https://github.com/langfuse/langfuse/pull/14876
fix(trace): comfortable info-favoring default + persistent split for full-page trace view (LFE-10729) by @nkabardin in https://github.com/langfuse/langfuse/pull/14855
fix(sessions): stop Back-button bounce from default-view URL pushes (LFE-10715) by @nkabardin in https://github.com/langfuse/langfuse/pull/14857
fix(events): show "select all across pages" banner on v4 events table (LFE-10733) by @nkabardin in https://github.com/langfuse/langfuse/pull/14859

chore(eslint): Optimize performance by @bezbac in https://github.com/langfuse/langfuse/pull/14842
chore(deps): bump js-yaml to 3.15.0 by @nimarb in https://github.com/langfuse/langfuse/pull/14844
chore(deps): bump fast-uri to 3.1.3 by @nimarb in https://github.com/langfuse/langfuse/pull/14846
chore: update links to legal docs on auth pages by @marcklingen in https://github.com/langfuse/langfuse/pull/14545
chore: tighten project_failure.active_projects by @sumerman in https://github.com/langfuse/langfuse/pull/14845
ci: add agentic weekly CI runtime analyst (gh-aw) by @wochinge in https://github.com/langfuse/langfuse/pull/14849
ci(deps): bump the github-actions group across 1 directory with 9 updates by @dependabot[bot] in https://github.com/langfuse/langfuse/pull/14861
ci: analyst follow-ups — fable model, chart series, analysis population by @wochinge in https://github.com/langfuse/langfuse/pull/14862
ci: add claude-fable-5 pricing for the analyst's AWF proxy by @wochinge in https://github.com/langfuse/langfuse/pull/14865
ci: run the CI runtime analyst on claude-opus-4-8 by @wochinge in https://github.com/langfuse/langfuse/pull/14867
ci: make the analyst's full report unconditional by @wochinge in https://github.com/langfuse/langfuse/pull/14874
ci: analyst legend fix, proactive optimization, intra-week action by @wochinge in https://github.com/langfuse/langfuse/pull/14877

Full Changelog: https://github.com/langfuse/langfuse/compare/v3.206.0...v3.207.0