Add meta-tools, collections, and attribution features

Meta-tools:
- Add ToolStep dataclass for tools calling other tools
- Implement execute_tool_step() with recursion depth limiting
- Add check_dependencies() for validating tool dependencies
- Add 'cmdforge check' command for dependency verification

Collections:
- Add collections API endpoints and database schema
- Create collections web UI (list and detail pages)
- Add collections to navigation header and homepage
- Document collections in REGISTRY.md

Attribution:
- Add source attribution fields to tool detail page
- Document source types (original, adapted, imported)
- Add license field documentation

Documentation updates across README, DESIGN.md, REGISTRY.md,
and new META_TOOLS.md design document.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <[email protected]>

src/cmdforge/cli/__init__.py

@@ -7,7 +7,7 @@ from .. import __version__
 
 from .tool_commands import (
     cmd_list, cmd_create, cmd_edit, cmd_delete, cmd_test, cmd_run,
-    cmd_ui, cmd_refresh, cmd_docs
+    cmd_ui, cmd_refresh, cmd_docs, cmd_check
 )
 from .provider_commands import cmd_providers
 from .registry_commands import cmd_registry
@@ -84,6 +84,11 @@ def main():
     p_docs.add_argument("-e", "--edit", action="store_true", help="Edit/create README in $EDITOR")
     p_docs.set_defaults(func=cmd_docs)
 
+    # 'check' command
+    p_check = subparsers.add_parser("check", help="Check dependencies for a tool (meta-tools)")
+    p_check.add_argument("name", help="Tool name")
+    p_check.set_defaults(func=cmd_check)
+
     # 'providers' command
     p_providers = subparsers.add_parser("providers", help="Manage AI providers")
     providers_sub = p_providers.add_subparsers(dest="providers_cmd", help="Provider commands")