Active-session telemetry can arrive with agentName and cliName recorded as unknown even when the Guardex branch/session key still carries agent/codex. Hivemind now treats unknown as missing and derives owner fields from concrete branch, session, or CLI signals before falling back.

Constraint: Viewer and MCP consumers use normalized HivemindSession.agent/cli values directly.

Rejected: Patch only the viewer label | other consumers would still receive unknown owners.

Confidence: high

Scope-risk: narrow

Directive: Do not pass literal unknown owner fields through when branch or session identity is concrete.

Tested: node /home/deadpool/Documents/recodee/agents-hivemind/node_modules/.pnpm/vitest@2.1.9_@types+node@22.19.17/node_modules/vitest/vitest.mjs run

Tested: node /home/deadpool/Documents/recodee/agents-hivemind/node_modules/.pnpm/@biomejs+biome@1.9.4/node_modules/@biomejs/biome/bin/biome check packages/core/src/hivemind.ts packages/core/test/hivemind.test.ts

Not-tested: pnpm --filter @colony/core typecheck; baseline missing @types/better-sqlite3 in this workspace