feat: add pull-main command

.rulesync/commands/pull-main.md

@@ -0,0 +1,45 @@
+---
+targets:
+  - "*"
+description: >-
+  Switch to main branch and pull latest changes with prune. Use when the user
+  wants to pull latest main, update main, or sync main with remote.
+---
+
+# Pull Main
+
+Switch to the `main` branch and pull the latest changes from `origin/main` while pruning stale remote-tracking references.
+
+## Step 1: Inspect Current State
+
+Check the current branch:
+
+```bash
+git branch --show-current
+```
+
+If already on `main`, note it for the final report.
+
+## Step 2: Switch to Main
+
+Switch to the `main` branch:
+
+```bash
+git switch main
+```
+
+## Step 3: Pull with Prune
+
+Pull the latest changes from `origin/main` with `--prune` to remove stale remote-tracking branches:
+
+```bash
+git pull --prune
+```
+
+## Step 4: Report Result
+
+Summarize the operation:
+
+- Whether a branch switch occurred
+- Number of commits pulled (fast-forward or merge)
+- Any stale remote-tracking branches that were pruned