Closes #4255

assembleOrgHealth in server/src/services/org-health.ts contained a stub that returned a hardcoded 0 for the agent count:

// Agent count — no org-scoped agents table yet; always 0 until one exists
Promise.resolve(0),

The agents table does exist — agents are stored as a JSONB array in member_profiles.agents (added in migration 014_agent_configs.sql). Because agentCount was always 0, suggestActions() always fired the "Register an agent to start integrating" CTA, regardless of how many agents the org had registered.

This PR replaces the stub with a query that counts all agents across the org's member profile:

SELECT COALESCE(SUM(COALESCE(jsonb_array_length(agents), 0)), 0) AS total
FROM member_profiles
WHERE workos_organization_id = $1

The double COALESCE handles: (inner) agents column being NULL on older rows; (outer) no matching profile row at all. Error path falls back to 0 (preserving the previous behavior on DB failure).

Visibility is intentionally not filtered — "has the org registered any agent" is the correct semantic for the CTA gate; a private agent is still a registered agent.

Non-breaking justification: server-side service change only; no schema, API, or protocol surface affected. Existing callers of assembleOrgHealth receive a more accurate suggested_actions array (the register_agent action is correctly absent when agents exist).

Pre-PR review:

• code-reviewer: approved — SQL is safe (parameterized), double COALESCE is correct, error fallback consistent with surrounding pattern; nit: outer SUM redundant given one-per-org constraint (harmless)
• internal-tools-strategist: approved — counting all visibility tiers is correct for this gate; display path for agents list is a separate read path, correctly out of scope

Triage-managed PR. This bot does not currently iterate on
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  issue.

See #3121
for context.

Session: https://claude.ai/code/session_01MGmeJKgbaF39WEmwEuDRQY

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