fix(messages): company channel fans out to every active agent

"Company" channel fell through to `listTopLevelAgentIds`, so a
broadcast on the most ambient-sounding channel in the product only
reached agents with `reports_to IS NULL`. The label said company;
the semantics said board-only. The rest of the org never knew a
message existed.

Add `listCompanyBroadcastAgentIds` — returns every non-terminated,
non-paused, non-pending agent for the company — and wire it through
the `company` case in `resolveMessageWakeTargets`. Board-only
fan-outs are still reachable: the `incident` channel keeps the
broader pingable set (paused-by-budget included) and direct DMs to
top-level agents work as before.

The prompt doc catches up to the runtime: company is explicitly
framed as all-hands, with board-only guidance redirected to DMs or
incidents. The message-dispatch unit test asserts the new fan-out.

src/main/database-base.ts

@@ -253,6 +253,7 @@ export class AppDatabaseBase {
   countActiveRunsForAgent(agentId: string, companyId: string) { return this.agents.countActiveRunsForAgent(agentId, companyId); }
   listDepartmentAgentIds(companyId: string, department: string) { return this.agents.listDepartmentAgentIds(companyId, department); }
   listTopLevelAgentIds(companyId: string) { return this.agents.listTopLevelAgentIds(companyId); }
+  listCompanyBroadcastAgentIds(companyId: string) { return this.agents.listCompanyBroadcastAgentIds(companyId); }
   listIncidentPingableAgentIds(companyId: string) { return this.agents.listIncidentPingableAgentIds(companyId); }
   findAgentName(agentId: string) { return this.agents.findAgentName(agentId); }
   listAgentNamesByIds(companyId: string, agentIds: readonly string[]) { return this.agents.listAgentNamesByIds(companyId, agentIds); }