Fix: Upgrade Typer to >=0.16.0 to resolve CLI help display error

This fixes the AttributeError: 'Flag' object has no attribute 'default'
error that occurred when running `cam --help` and other help commands.

The issue was caused by Typer 0.12.x having incompatibilities with the
Flag() definition syntax used in the codebase. Typer 0.16.0+ includes
the necessary fixes for proper Flag handling.

Changes:
- Updated typer dependency from >=0.12.0 to >=0.16.0 in pyproject.toml

Testing:
- Verified `cam --help` displays correctly without errors
- Verified subcommands help work: `cam agent --help`, `cam plugin --help`, `cam mcp --help`
- All commands now show proper help output with formatted options and commands

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: Vadiml1024

pyproject.toml

@@ -14,7 +14,7 @@ dependencies = [
   "requests>=2.31.0",
   "PyYAML>=6.0.1",
   "python-dotenv>=1.0.1",
-  "typer>=0.12.0",
+  "typer>=0.16.0",
   "click>=8.1.7",
   "rich>=13.7.0",
   "pydantic>=2.6.0",