cache bmignore list during bisync

Signed-off-by: phernandez <paul@basicmachines.co>

Author: phernandez

docs/cloud-cli.md

@@ -211,24 +211,68 @@ bm sync --watch --interval 30
 
 ### Bisync Profiles
 
-Bisync supports different conflict resolution strategies:
+Bisync supports three conflict resolution strategies with different safety levels:
 
-- **balanced** (default, recommended): Auto-resolve to newer file, max 25 deletes
-- **safe**: Keep both versions on conflict, max 10 deletes
-- **fast**: Fast iteration mode, max 50 deletes
+| Profile | Conflict Resolution | Max Deletes | Use Case |
+|---------|-------------------|-------------|----------|
+| **balanced** | newer | 25 | Default, recommended for most users |
+| **safe** | none | 10 | Keep both versions on conflict |
+| **fast** | newer | 50 | Rapid iteration, higher delete tolerance |
 
-To use a specific profile:
+**Profile Details:**
+
+- **safe**:
+  - Conflict resolution: `none` (creates `.conflict` files for both versions)
+  - Max delete: 10 files per sync
+  - Best for: Critical data where you want manual conflict resolution
+
+- **balanced** (default):
+  - Conflict resolution: `newer` (auto-resolve to most recent file)
+  - Max delete: 25 files per sync
+  - Best for: General use with automatic conflict handling
+
+- **fast**:
+  - Conflict resolution: `newer` (auto-resolve to most recent file)
+  - Max delete: 50 files per sync
+  - Best for: Rapid development iteration with less restrictive safety checks
+
+**How to Select a Profile:**
+
+The default profile (`balanced`) is used automatically with `bm sync`:
 
 ```bash
+# Uses balanced profile (default)
+bm sync
+```
+
+For advanced control, use `bm cloud bisync` with the `--profile` flag:
+
+```bash
+# Use safe mode
 bm cloud bisync --profile safe
+
+# Use fast mode
+bm cloud bisync --profile fast
+
+# Preview changes with specific profile
+bm cloud bisync --profile safe --dry-run
 ```
 
-Check available profiles:
+**Check Available Profiles:**
 
 ```bash
 bm cloud status
 ```
 
+This shows all available profiles with their settings.
+
+**Current Limitations:**
+
+- Profiles are hardcoded and cannot be customized
+- No config file option to change default profile
+- Profile settings (max_delete, conflict_resolve) cannot be modified without code changes
+- Profile selection only available via `bm cloud bisync --profile` (advanced command)
+
 ### Establishing New Baseline
 
 If you need to force a complete resync:

src/basic_memory/cli/commands/cloud/bisync_commands.py

@@ -238,6 +238,8 @@ def convert_bmignore_to_rclone_filters() -> Path:
     Reads ~/.basic-memory/.bmignore (gitignore-style) and converts to
     ~/.basic-memory/.bmignore.rclone (rclone filter format).
 
+    Only regenerates if .bmignore has been modified since last conversion.
+
     Returns:
         Path to converted rclone filter file
     """
@@ -248,6 +250,13 @@ def convert_bmignore_to_rclone_filters() -> Path:
     # Create rclone filter path: ~/.basic-memory/.bmignore -> ~/.basic-memory/.bmignore.rclone
     rclone_filter_path = bmignore_path.parent / f"{bmignore_path.name}.rclone"
 
+    # Skip regeneration if rclone file is newer than bmignore
+    if rclone_filter_path.exists():
+        bmignore_mtime = bmignore_path.stat().st_mtime
+        rclone_mtime = rclone_filter_path.stat().st_mtime
+        if rclone_mtime >= bmignore_mtime:
+            return rclone_filter_path
+
     # Read .bmignore patterns
     patterns = []
     try: