docs(agents): install merge-train snippet

[kjgbot]

Installs @agent-relay/merge-train-snippet@1.0.0 via prpm: base trunk, verify locally, label mergeable when ready.

🤖 Generated with Claude Code

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Note

Low Risk
Documentation and lockfile-only change; no runtime or CI workflow edits in this diff.

Overview
Adds @agent-relay/merge-train-snippet@1.0.0 to the repo and records it in prpm.lock (append-to-AGENTS.md snippet metadata, updated lock timestamp).

AGENTS.md gains a new prpm-managed section describing the merge train: PRs target trunk (not main), CI runs only on trunk → main, contributors must verify locally and use the mergeable label when ready, plus constraints (no direct merges/pushes to trunk/main, don’t change trunk CI gates) and how the merge agent sweep works (with an interim note that the worker isn’t deployed yet).

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✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.