Plan: UI discoverability pass (Experiments panel)

[shaal]

Summary

This PR contains a plan document only — no feature code. It
proposes a UI discoverability pass for the features landed in PR #1
(RuLake-inspired roadmap).

The core issue: three features (`?snapshots=1` save/share,
`?crosstab=1` cross-tab sync, and the library-only 1-bit
quantization) ship with zero UI — only discoverable by reading
docs or chapter text. Two other features (federation, consistency
modes) already use the right pattern: URL flag presets the initial
state of an always-visible UI control.

This plan proposes a single `🧪 Experiments` disclosure panel that:

1. Consolidates all feature toggles into one collapsible section at the bottom of the training panel.
2. Un-gates the currently-hidden snapshot/share and cross-tab rows — render always, default OFF, flag continues to work as a preset.
3. Adds a disabled row for 1-bit quantization with a tooltip explaining it's library-only.
4. Adds a `confirm()` guardrail on destructive Import actions.
5. Adds a `[Learn]` link per row that calls `window.ELI15.openChapter(id)`.

Scope is small: ~250 lines, one PR, primarily in `AI-Car-Racer/uiPanels.js`. No feature module is touched.

See `docs/plan/ui-discoverability-pass.md` for:

• 10-task checklist status tracker
• Default-state table per feature
• Exit criteria + harness requirements
• Design trade-offs (native `
  Details

  ` over custom widgets, one consolidated panel over scattered toggles, no default-on flips)

Why plan-only first

Per the working discipline on this project, non-trivial UX
changes get a reviewable plan document before code. This PR is
the reviewable plan; the implementation PR will follow once the
plan is approved.

What's NOT in this plan

• No new URL flags.
• No default-on flips (Federation, Cross-tab, Snapshots, Quantization all stay OFF by default).
• No redesign of the existing training panel.
• No integration of quantization into the archive hot path.
• No real community archive URLs published.

Test plan

• Review `docs/plan/ui-discoverability-pass.md` end-to-end.
• Confirm the default-state table matches the roadmap's conservatism posture (plain URL = plain behaviour).
• Confirm the exit criteria are testable via agent-browser.
• Approve or request specific changes to the design calls (single-panel vs. scattered, default-off vs. default-on, native vs. custom widgets).

After approval, an implementation PR lands the actual ~250 lines + the `tests/experiments-panel-smoke.html` harness.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 9f737d0d-fdbb-4b15-896d-2937491d9111

📥 Commits

Reviewing files that changed from the base of the PR and between ee2dd34 and d778440.

📒 Files selected for processing (1)

• docs/plan/ui-discoverability-pass.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ui-discoverability-pass

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