feat(perl-mode): add perl language mode with LSP support

[cxxxr]

Summary

• Adds perl language mode to Lem editor
• Includes syntax highlighting and LSP integration
• Includes unit tests for mode functionality
• Part of feat: Add language modes for unsupported languages #2066

Changes

• New extension: lem-perl-mode
• Registered in lem/extensions system
• Test suite in extensions/perl-mode/tests/

Test Plan

• Mode activates for perl file extensions
• Syntax highlighting works correctly
• LSP connects (if language server installed)
• Build succeeds: make build
• Tests pass: .qlot/bin/rove extensions/perl-mode/lem-perl-mode.asd

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❌ Code Contractor Validation: FAILED

✓ Code Contractor Validation Result
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

📊 Statistics:
  Files Changed:    12
  Lines Added:      781
  Lines Deleted:    4
  Total Changed:    785
  Delete Ratio:     0.01 (1%)

Status: FAILED ❌

🤖 AI Providers:
  - codex — model: (Codex default)

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
📋 Validation Rules:

❌ max_files_changed
❌ max_total_changed_lines
✅ max_delete_ratio
❌ defpackage_rule
❌ file_structure_rule
❌ loop_keywords_rule
❌ naming_conventions_rule
❌ docstring_rule
❌ internal_symbol_rule
❌ error_handling_rule
❌ frontend_interface_rule
❌ functional_style_rule
❌ dynamic_symbol_call_rule
❌ alexandria_usage_rule
❌ macro_style_rule

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
⚠️ Violations Found (14):

[ERROR] max_files_changed
  Too many files changed: 12 > 10
  Limit: 10
  Actual: 12

[ERROR] max_total_changed_lines
  Too many lines changed: 785 > 400
  Limit: 400
  Actual: 785

[ERROR] ai_auth_error
  AI provider authentication failed for check "defpackage_rule". Please verify the API key configuration.
  ❌ Reason:
    codex query failed for rule defpackage_rule_2

[ERROR] ai_auth_error
  AI provider authentication failed for check "file_structure_rule". Please verify the API key configuration.
  ❌ Reason:
    codex query failed for rule file_structure_rule_2

[ERROR] ai_auth_error
  AI provider authentication failed for check "loop_keywords_rule". Please verify the API key configuration.
  ❌ Reason:
    codex query failed for rule loop_keywords_rule_2

[ERROR] ai_auth_error
  AI provider authentication failed for check "naming_conventions_rule". Please verify the API key configuration.
  ❌ Reason:
    codex query failed for rule naming_conventions_rule_2

[WARNING] ai_auth_error
  AI provider authentication failed for check "docstring_rule". Please verify the API key configuration.
  ❌ Reason:
    codex query failed for rule docstring_rule_2

[ERROR] ai_auth_error
  AI provider authentication failed for check "internal_symbol_rule". Please verify the API key configuration.
  ❌ Reason:
    codex query failed for rule internal_symbol_rule_2

[ERROR] ai_auth_error
  AI provider authentication failed for check "error_handling_rule". Please verify the API key configuration.
  ❌ Reason:
    codex query failed for rule error_handling_rule_2

[WARNING] ai_auth_error
  AI provider authentication failed for check "frontend_interface_rule". Please verify the API key configuration.
  ❌ Reason:
    codex query failed for rule frontend_interface_rule_2

[ERROR] ai_auth_error
  AI provider authentication failed for check "functional_style_rule". Please verify the API key configuration.
  ❌ Reason:
    codex query failed for rule functional_style_rule_2

[ERROR] ai_auth_error
  AI provider authentication failed for check "dynamic_symbol_call_rule". Please verify the API key configuration.
  ❌ Reason:
    codex query failed for rule dynamic_symbol_call_rule_2

[ERROR] ai_auth_error
  AI provider authentication failed for check "alexandria_usage_rule". Please verify the API key configuration.
  ❌ Reason:
    codex query failed for rule alexandria_usage_rule_2

[ERROR] ai_auth_error
  AI provider authentication failed for check "macro_style_rule". Please verify the API key configuration.
  ❌ Reason:
    codex query failed for rule macro_style_rule_2

Fix Suggestions

• ai_auth_error

• ai_auth_error

• ai_auth_error

• ai_auth_error

• ai_auth_error

• ai_auth_error

• ai_auth_error

• ai_auth_error

• ai_auth_error

• ai_auth_error

• ai_auth_error

• ai_auth_error

• Fix for violation errors checked above

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