fix: prevent Windows reserved device names from being added to directory checks and simplify bash description parameter

[01luyicheng]

Summary

This PR fixes two issues:

1. Fixes nul file generate #11586: Prevents Windows reserved device names (CON, PRN, AUX, NUL, COM1-9, LPT1-9) from being added to directory permission checks in bash tool. Previously, when running commands with output redirection to these device names (e.g., echo "test" > nul), bash tool would attempt to resolve these paths and add them to directory checks, causing issues on Windows.

2. Fixes Kimi K2.5 Free OpenCode Zen throws an error #11591: Simplifies bash tool's description parameter to avoid JSON Schema validation errors with Kimi K2.5 model in Zen mode. The previous multi-line description with examples caused validation failures.

Changes

• Added WINDOWS_RESERVED_DEVICE_NAMES constant with all Windows reserved device names
• Added isWindowsReservedDeviceName() function to check if a path is a reserved device name
• Modified path resolution logic to skip reserved device names when processing command arguments
• Simplified description parameter from multi-line text with examples to a single concise description
• Added comprehensive file header comment with file purpose, author, creation date, input/output signatures, dependencies, and interaction with other modules
• Added implementation explanation for Windows reserved device name checking logic

Testing

• Tested on Windows with commands that redirect output to nul device
• Verified that reserved device names are properly skipped during path resolution
• Confirmed that simplified description parameter works with Kimi K2.5 model in Zen mode

Related Issues

Fixes #11586
Fixes #11591

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