feat: add hermes backup and hermes import commands (#7997)

* feat: add `hermes backup` and `hermes import` commands

hermes backup — creates a zip of ~/.hermes/ (config, skills, sessions,
profiles, memories, skins, cron jobs, etc.) excluding the hermes-agent
codebase, __pycache__, and runtime PID files. Defaults to
~/hermes-backup-<timestamp>.zip, customizable with -o.

hermes import <zipfile> — restores from a backup zip, validating it
looks like a hermes backup before extracting. Handles .hermes/ prefix
stripping, path traversal protection, and confirmation prompts (skip
with --force).

29 tests covering exclusion rules, backup creation, import validation,
prefix detection, path traversal blocking, confirmation flow, and a
full round-trip test.

* test: improve backup/import coverage to 97%

Add 17 additional tests covering:
- _format_size helper (bytes through terabytes)
- Nonexistent hermes home error exit
- Output path is a directory (auto-names inside it)
- Output without .zip suffix (auto-appends)
- Empty hermes home (all files excluded)
- Permission errors during backup and import
- Output zip inside hermes root (skips itself)
- Not-a-zip file rejection
- EOFError and KeyboardInterrupt during confirmation
- 500+ file progress display
- Directory-only zip prefix detection

Remove dead code branch in _detect_prefix (unreachable guard).

* feat: auto-restore profile wrapper scripts on import

After extracting backup files, hermes import now scans profiles/ for
subdirectories with config.yaml or .env and recreates the ~/.local/bin
wrapper scripts so profile aliases (e.g. 'coder chat') work immediately.

Also prints guidance for re-installing gateway services per profile.

Handles edge cases:
- Skips profile dirs without config (not real profiles)
- Skips aliases that collide with existing commands
- Gracefully degrades if hermes_cli.profiles isn't available (fresh install)
- Shows PATH hint if ~/.local/bin isn't in PATH

3 new profile restoration tests (49 total).

hermes_cli/main.py

@@ -2818,6 +2818,18 @@ def cmd_config(args):
     config_command(args)
 
 
+def cmd_backup(args):
+    """Back up Hermes home directory to a zip file."""
+    from hermes_cli.backup import run_backup
+    run_backup(args)
+
+
+def cmd_import(args):
+    """Restore a Hermes backup from a zip file."""
+    from hermes_cli.backup import run_import
+    run_import(args)
+
+
 def cmd_version(args):
     """Show version."""
     print(f"Hermes Agent v{__version__} ({__release_date__})")
@@ -4904,7 +4916,43 @@ For more help on a command:
         help="Show redacted API key prefixes (first/last 4 chars) instead of just set/not set"
     )
     dump_parser.set_defaults(func=cmd_dump)
-    
+
+    # =========================================================================
+    # backup command
+    # =========================================================================
+    backup_parser = subparsers.add_parser(
+        "backup",
+        help="Back up Hermes home directory to a zip file",
+        description="Create a zip archive of your entire Hermes configuration, "
+                    "skills, sessions, and data (excludes the hermes-agent codebase)"
+    )
+    backup_parser.add_argument(
+        "-o", "--output",
+        help="Output path for the zip file (default: ~/hermes-backup-<timestamp>.zip)"
+    )
+    backup_parser.set_defaults(func=cmd_backup)
+
+    # =========================================================================
+    # import command
+    # =========================================================================
+    import_parser = subparsers.add_parser(
+        "import",
+        help="Restore a Hermes backup from a zip file",
+        description="Extract a previously created Hermes backup into your "
+                    "Hermes home directory, restoring configuration, skills, "
+                    "sessions, and data"
+    )
+    import_parser.add_argument(
+        "zipfile",
+        help="Path to the backup zip file"
+    )
+    import_parser.add_argument(
+        "--force", "-f",
+        action="store_true",
+        help="Overwrite existing files without confirmation"
+    )
+    import_parser.set_defaults(func=cmd_import)
+
     # =========================================================================
     # config command
     # =========================================================================