docs(weave): Add preset signals to monitors page

[captainshar]

Summary

• Adds a new "Enable preset signals" section to the existing monitors page
• Documents the suggested classifier monitors feature from PRs #40741 and #40742
• Positioned before the custom monitors section so users discover the simpler option first

What's covered

• 13 preset signals: 7 Quality signals (hallucination, low quality, user frustration, jailbreaking, NSFW, lazy, forgetful) and 6 Error signals (network error, ratelimited, request too large, bad request, bad response, bug)
• Enable workflow: One-click from signal cards or batch via "Add signals" drawer
• Manage workflow: View and remove active signals via "Manage signals" drawer
• How signals work: Trace selection, prompt construction, LLM scoring, result storage, batching
• Comparison table: Signals vs custom monitors

Open questions for reviewer

• Should "signals" be the public-facing term, or "classifier monitors"? (Draft uses "signals" based on UI terminology)
• Should this be a standalone page at signals.mdx or a section on the monitors page? (Draft adds it as a section — can be split later)
• Is the feature ready for public docs, or should this wait for the weave_trace_analysis_frontend feature flag to be removed?
• Should we mention the underlying model (gpt-oss-20b) by name, or keep it as "W&B Inference model"? (Draft uses the latter)

Sources

Source	Purpose
PR #40741	Core CRUD infrastructure, classifier config, hook logic
PR #40742	Suggested signal cards UI, one-click enable
Existing monitors.mdx	Page structure, style conventions
Slack/Glean internal discussions	Feature naming, positioning, roadmap context

Test plan

• Verify Mintlify renders the page correctly (tables, links, section anchors)
• Confirm the cross-reference link to #how-to-create-a-monitor-in-weave resolves correctly
• SME reviews signal descriptions against actual classifier prompts in defaultClassifiersConfig.ts
• Verify the W&B Inference link /inference/models resolves

🤖 Generated with Claude Code

[captainshar]

Resume prompt

I'm working on PR #2342 in wandb/docs (branch scampbell/weave-signals-docs). This adds documentation for the new "signals" feature (preset classifier monitors) to the existing monitors page at weave/guides/evaluation/monitors.mdx. The feature was implemented in wandb/core PRs #40741 and #40742 by jtschoonhoven. The draft covers all 13 preset classifiers (7 quality, 6 error), enable/manage workflows, and a comparison table. Key open questions: should "signals" be the public term, should this be its own page, and is the feature flag (weave_trace_analysis_frontend) removed yet for GA? Check PR comments for reviewer feedback and iterate.

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