Files
Oleg Isonen 26ba4728fa docs: Explain Builder feature flags (#6581)
Each Builder feature flag now has a short comment explaining what
enabling it changes.

## Checklist
- [x] Verify latest-head CI.
- [x] Address both flag-description review comments and reply before
resolving their threads.
- [x] Document all five flags next to their declarations.
- [x] Verify the comments against the current flag call sites.
- [x] Review documentation impact: code comments only; no user-facing
docs change.
- [x] Run feature-flags typecheck, formatting, and diff checks.

Follow-up to #6576.
2026-10-22 10:10:32 +02:00
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