Added git-manager, updated READMEs

vendor/claude-code/plugins/git-manager/.claude-plugin/plugin.json

@@ -0,0 +1,9 @@
+{
+  "name": "git-manager",
+  "description": "Manages git operations across one or more repositories (code, Obsidian vaults, etc.) through a single whitelisted wrapper script, avoiding the cd/chaining patterns that break Claude Code's Bash permission whitelist.",
+  "version": "1.0.0",
+  "author": {
+    "name": "Henner"
+  },
+  "keywords": ["git", "version-control", "workflow"]
+}