docs: fix config drift in on-call module

[ysyneu]

Doc Review — 2026-03-23

Mode: audit (scope: on-call)
Findings: 9 total — 1 high, 4 medium, 4 low
Applied: 4 (1 high, 3 medium)

Changes

Finding	Type	Doc	Action
f001	config_drift	custom-fields.mdx	Text field limit 500 → 3000 chars
f002	config_drift	custom-actions.mdx	Custom actions per channel 3 → 5
f003	config_drift	search-view-incident.mdx	Query window: "1 month" → tier-based (Free=30d, Standard=180d, Pro=366d)
f005	config_drift	insights.mdx	Export limit 100,000 → 10,000

Skipped

Finding	Reason
f004	User confirmed 4MB image upload limit is correct (frontend has stale 10MB check)
f006	Inhibition 10-min scope claim could not be verified in code — needs manual review
f007	Fair rotation feature — needs frontend visibility confirmation
f008	Hourly/monthly rotation units — backend-only, frontend uses raw seconds
f009	Mobile Critical Alerts (iOS) — low severity, needs deeper mobile app investigation

Review checklist

• Verify config field names and defaults match current code
• Check that feature descriptions accurately reflect user-facing behavior
• Ensure tone and style match the rest of the docs

Mapping warnings

None

🤖 Generated with Claude Code