chore: dashboard docs and complexity limits for P6 #377

Why

P6 must fit the Complexity Docket limits (v5 review E7) and the guides must match (ledger section E).

In scope

Apply the complexity limits to the new dashboard modules; update dashboard.md, telemetry.md, usage-scorecard-metrics.md and models.md.

Out of scope

Other guides.

Acceptance criteria

• pnpm run lint:cc passes with no new exceptions
• The guides match the panels

Dependencies

Blocked by: #370, #375

Blocks: #383, #388

Plan

• Release: 4.0.0-beta.4
• Size: size:S · Workstream: ws:ga-readiness
• Epic: feat: project-scope P6, the dashboard for all work (epic) #301
• Card: P6-15 in the card inventory
• Sources: v5 impact review (docs(plans): v4 GA master plan, supersession ledger and v5 registers #290) E7; Supersession ledger (docs(plans): v4 GA master plan, supersession ledger and v5 registers #290) section E

Verification

• pnpm run lint:cc
• pnpm run lint:md