vault-librarian-prompt: add Step 4 git push

Local commits (auto-fix per-op + Inbox flag commit) are invisible to Ryan and
Obsidian sync until pushed. Add explicit final-step 'git push origin master',
with instruction to report push failure rather than claim changes landed.

vault-librarian-prompt.md

@@ -54,6 +54,12 @@ HOW to flag (two places, both required):
 2. Your FINAL RESPONSE is auto-delivered to this Matrix room — make it the mobile-friendly
    summary (see output contract). The Inbox note holds the detail; the message is the nudge.
 
+## Step 4 — PUSH (so Obsidian sync + Ryan actually see the changes)
+Local commits are invisible to Ryan until pushed. As the LAST action, push the vault:
+  cd /vault && git push origin master
+(Auto-fix ops committed per-op and the Inbox flag commit all get pushed together. If the
+push fails, say so in your final message — do NOT claim changes landed.)
+
 NOTE: the `0 System area/09 Archive of pre-RJFI tree` subtree is a SANCTIONED garbage dump
 (Ryan's ruling). NEVER flag, fix, or scan inside it — its broken links, stray files, and
 odd structure are all intentional/allowed. The tooling already excludes it.