feat: add atomic session prompt and wait

[almogdepaz]

summary

• add one authenticated server-owned prompt-and-wait operation pinned to a stable broker session id
• establish a sequence-aware output boundary before sending input and return bounded typed outcomes
• add wolfpack session prompt <session> <prompt...> --until <text>
• preserve replay/reconnect correctness, bounded Unicode matching, and existing standalone send/wait behavior
• publish the control-api contract and document the phase-1 boundary

scope

this is phase 1 of #210: explicit output_contains waiting only. typed agent-state/task predicates remain deferred to #209/#211, and explicit operation cancellation remains deferred.

verification

• bun run typecheck
• bun test — 1855 pass, 0 fail across 122 files
• real-broker atomic immediate-output integration
• deterministic control-schema generation
• git diff --check

partially addresses #210