feat: Add Obsidian vault configuration and documentation for navigation and memory management

.gitignore

@@ -17,3 +17,13 @@ scripts/mattermost/.env
 scripts/mattermost/.venv/
 scripts/mattermost/generated/*
 !scripts/mattermost/generated/.gitkeep
+
+# Obsidian local runtime state
+.obsidian/workspace*.json
+.obsidian/workspace-mobile*.json
+.obsidian/hotkeys.json
+.obsidian/community-plugins.json
+.obsidian/plugins/
+.obsidian/snippets/
+.obsidian/cache/
+.trash/