v1.51.0

Highlights

• Reliable agent-to-agent delivery — fixed the redelivery loop and the "stuck in the input box, never sent" failure that affected notify-parent, polite msg, and session_send. One root fix in the submit primitive (send_verified now confirms on box-cleared) plus idempotent, id-anchored delivery so a landed message is delivered exactly once and never silently dropped.
• Contributor mode — a bundled contributor role makes the agentwire dev helper session repo-aware: it coaches newcomers through setup, filing good issues, and the fork → PR flow. agentwire dev now carries it by default and honors a local .agentwire.yml owner-override (--roles escape hatch included). New onboarding nudges point users at the helper session (README / quickstart / agentwire init).

Fixes

• agentwire msg: idempotent delivery + reliable submit — kill the redelivery loop (#621)
• Shared-dir guard no longer counts infrastructure service sessions as conflicts, so a project session can start from the portal even while services co-reside in the repo dir (#618)

Features

• Bundled contributor role + agentwire dev default + onboarding (#619, #620)
• New self-heal verbs: agentwire msg purge <session> and msg flush --force (+ MCP), plus GC of an exited sender's still-pending outbound messages

Chores

• Greened the ruff CI lint job (removed an unused import) (#625)

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