test(dag): align command routing contracts

[LeXwDeX]

Summary

• align legacy command assertions with the proactive composable router contract
• preserve explicit empty-or-whitespace guarding for /dag-flow
• keep post-start no-poll behavior covered

Evidence

• RED: command.test.ts reproduced 4 pass / 3 fail locally and in dev CI
• GREEN: OpenCode command tests 7/7
• GREEN: Core command tests 19/19
• GREEN: Core and OpenCode typecheck
• GREEN: repository lint 4850 warnings / 0 errors
• GREEN: full pre-push typecheck 29/29

Root cause: the proactive prompt rewrite intentionally replaced the old fixed profiles, but the legacy registry tests still asserted the removed wording; the whitespace clause also needed to remain explicit.