fix: consistent skill name length validation across all validators

[gn00295120]

Fixes #199

Description

The init_skill.py help text mentioned 'Max 40 characters' while quick_validate.py enforced 'max 64 characters', causing inconsistency.

Changes

• Added validate_skill_name() function to init_skill.py
• init_skill.py now validates name before creating directory
• Updated help text from 'Max 40' to 'Max 64' characters
• Both validators now use the same 64 character limit

Testing

• Tested with names under 64 characters (should pass)
• Tested with names over 64 characters (should fail)
• Verified consistency between init_skill.py and quick_validate.py

[Copilot]

Pull request overview

This PR fixes an inconsistency between init_skill.py and quick_validate.py regarding skill name length validation. Previously, init_skill.py documentation mentioned a 40-character limit while quick_validate.py enforced a 64-character limit. The changes standardize both validators to use 64 characters as the maximum skill name length.

Changes:

• Added a validate_skill_name() function to init_skill.py to validate skill name format and length before creating directories
• Updated help text in init_skill.py from "Max 40 characters" to "Max 64 characters"
• Both validators now consistently enforce a 64-character maximum

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[Copilot]

The re module is imported inside the function. For better practice and performance, move this import to the top of the file with other module imports (after line 15).

[gn00295120]

Note on potential duplicate

This PR may overlap with #200 (submitted 2026-01-02). However, this implementation includes:

Improvements in this PR:

• Added complete validate_skill_name() function with full validation logic
• init_skill.py now validates name before creating directory (not just hint text)
• Validates both length AND naming convention (hyphen-case, no consecutive hyphens)
• Provides actual validation, not just documentation update

PR #200 only:

• Updated hint text from 'Max 40' to 'Max 64'
• Did not add actual validation logic

Recommendation:
This PR provides more comprehensive validation and could be considered as an enhancement to #200's approach.