[TheGreatAxios]

Summary

• Deletes workbench-host test cases in packages/agent-directory (route 404 guards, slug resolution, status, skill-pin) now that workbench-host filtering by name is gone — hostGuardedRow only checks for a missing asset, and a workbench is a plain tenant.
• Deletes the purposeAgentDefinitions catalog-utility test in packages/agent-directory/src/client.test.ts, which only asserted the names of workflows (workbench-digest, last-30-days-research) removed from the trimmed workflow catalog.
• Deletes packages/workflows/test/unreachable-message-contract.test.ts: the pinned vendor throw string no longer appears in vendor/intx/hub-sessions/src/session-service.ts at all (the vendor file changed); isAgentUnreachableError is still used elsewhere (agent-directory, chat, workflows) so the classifier itself stays.
• Fixes packages/webhook-triggers/test/launch.test.ts's fake crypto provider, which returned the raw signed input instead of a 64-byte Ed25519 signature (breaking every test that reaches the sign step), and corrects one assertion's expected routeMail call count to match deliverWhenRoutable's existing one-retry-when-routable contract instead of assuming no retry.

Test plan

• bun test packages/agent-directory packages/workflows packages/webhook-triggers — all green
• bun run typecheck
• bun run lint
• bun run fmt