docs(governance): add Governance Dashboard pages for ADP GA

[micheleRP]

Summary

Greenfield Governance Dashboard pages for the Agentic Data Plane GA (2026-06-15), aligned to the Governance V0 PRD (Blair McKee, 2026-04-20) and RFC 006: Governance Without Governator (Chris Chapman, 2026-04-27). Implements workflow #8 (DOC-2116) per the Governance Dashboard companion plan.

Preview pages

• Read the Governance Overview (new)
• Agent Network (new — GA stub)
• Authorization Denials and Violations (new — GA stub)

What this PR does

• governance/dashboard/index.adoc — Beta deliverable (V0). Reading guide for the V0 single-page Overview. 8 sections: Prerequisites, Open the dashboard, Reading each widget (5 sub-sections — summary cards, token spend by LLM provider, events over time, agents, MCP servers), Reading the dashboard for your role (4 persona sub-sections — CIO/CFO, CISO, Head of Trust, demo-readiness), Investigate via transcript deep-links, Empty states, What's coming at GA, Next steps.
  • Microcent cost framing (1 cent = 100 microcents, $1 = 10,000 microcents) lifted verbatim from RFC 006.
  • Agent state badge mapping covers all 7 states from AgentRegistryService (Running, Stopped, Starting/Creating transient, Stopping/Deleting transient, Degraded w/ state_reason, Failed w/ state_reason).
  • 3 learning objectives (observable verbs: identify, choose, investigate — covering awareness/comprehension/skill).
• governance/dashboard/agent-network.adoc — GA stub. Renders a "Coming at GA" panel + cross-links to the V0 overview and the violations stub.
• governance/dashboard/violations.adoc — GA stub. Same shape as agent-network.
• Delete governance/dashboard.adoc — 4-line placeholder, superseded by the sub-folder structure.
• Update modules/ROOT/nav.adoc — Trust & Governance section now has a Governance dashboard sub-section with 3 children (Read the overview / Agent Network / Authorization denials and violations). Guardrails / Budgets / Kill switch entries unchanged. Coordinates with the Guardrails companion plan which will modify the same Trust & Governance section in a separate PR.

Status

• Pre-beta (May 15): docs commit to GA only — the V0 reading guide in this PR is best-effort if it lands by then, not a beta deliverable. The two GA stubs render "Coming at GA" panels in the meantime.
• GA (2026-06-15): stubs filled with live walkthrough content from adp-production once the V1 design + UI surface lands. Master Weeks 4–6 sequencing per the companion plan.
• Plan: https://redpandadata.atlassian.net/wiki/spaces/DOC/pages/1882292252

Open questions / known issues

The V0 prototype lands on adp-production 2026-05-08 per the PRD milestone — most TODOs resolve via that walkthrough. The 18 open design questions are catalogued in the companion plan (groups A–D); the highlights:

• Persona vocabulary mismatch. The PRD names HoT (Head of Trust), CIO/CFO, CISO, and FDE; this PR uses canonical docs-team-standards personas (evaluator, platform_admin, app_developer) in the :personas: field and surfaces the PRD names in the persona-section headings only. // TODO: markers on each page flag the alignment question for docs-team-standards.
• V1 design specs missing. Agent topology graph and authorization denial feed are V1 PRD one-liners; no design doc exists yet. GA pages blocked on those landing.
• Microcent cost framing may simplify in the UI before GA. If so, the prose loosens.
• Time-range selector defaults, dimension toggle UX, error-count source, tool-invocation source — all flagged with // TODO: markers, resolve via V0 prototype walkthrough.
• agent-network.adoc and violations.adoc are stubs — full content arrives in subsequent commits Master Weeks 4–6.
• Master plan was updated to follow the PRD/RFC in v17 (2026-04-28) — pre-beta scope for Consolidate Overview, retire LA admonition, add section landings #8 shifted from "topology + violations + auth denials" (originally listed) to V0's "summary cards + provider breakdown + fleet + activity"; topology + violations moved to GA per PRD; "policy editing from dashboard" pushed to V2 (post-GA, out of scope).

Test plan

• Local build (npm run build && npm run serve) renders the Trust & Governance > Governance dashboard sub-section with 3 children; index page resolves all xrefs (transcripts, byoa-telemetry, create-agent, mcp:index).
• Walk the V0 prototype on adp-production (lands 2026-05-08); confirm widget descriptions match the live UI; capture annotated screenshot.
• PRD AC walkthrough: a CIO can answer "how much did we spend?" within 30 seconds (AC-1); a CISO can see every agent + MCP server (AC-3); a HoT can find the agent with the highest error count (AC-4); an FDE can demo cold in under 2 minutes (AC-9). Per PRD §"Acceptance Criteria."
• Confirm transcript deep-link target paths resolve once workflow docs(governance): scaffold Guardrails pages for ADP GA #7 (Transcripts) PR Reapply PR #560: Transcripts documentation rewrite for ADP GA #3 merges and stabilizes the URL pattern.
• Resolve persona vocabulary alignment with docs-team-standards.
• Fill agent-network.adoc and violations.adoc stubs with V1 walkthroughs (Master Weeks 4–6).
• Editorial pass via docs-team-standards:review on every new page.
• Remove adp-la.adoc partial includes at GA (Master Weeks 7–8).

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