feat(config): complete config-driven architecture migration

Finalize the config-driven architecture migration with comprehensive
configuration expansion and environment variable replacement.

Major Changes:
- config.defaults.toml: Add 54 new configuration sections for complete system coverage
  * Tool detection and plugin configuration
  * AI integration settings
  * SSH configuration options
  * Extension system configuration
  * Key Management Service (KMS) settings
- core/nulib/env.nu: Replace 81 environment variables with config-driven accessors
  * Convert all context-based lookups to config-get calls
  * Maintain backward compatibility with existing ENV variables
  * Streamline configuration loading and validation
- core/versions: Update Nushell version requirement to 0.107.1

New Files:
- core/nulib/lib_provisioning/utils/git-commit-msg.nu: Add git commit message utilities
- utils/commit-msg.nu: Add commit message generation helper

This completes the v2.0.0 config-driven architecture migration, replacing
200+ environment variables with hierarchical configuration management.

core/nulib/lib_provisioning/utils/git-commit-msg.nu

@@ -0,0 +1,149 @@
+# Git commit message generator
+# Generates a commit message file based on current changes without creating a commit
+
+# Generate commit message file based on staged and unstaged changes
+export def "generate-commit-message" [
+    --file (-f): string = "COMMIT_MSG.txt"  # Output file for commit message
+    --staged (-s): bool = false              # Only consider staged changes
+    --unstaged (-u): bool = false            # Only consider unstaged changes
+] -> nothing {
+    # Determine what changes to analyze
+    let analyze_staged = if $staged or (not $unstaged) { true } else { false }
+    let analyze_unstaged = if $unstaged or (not $staged) { true } else { false }
+
+    # Get git status
+    let git_status = (git status --porcelain | lines | where { $in | str length > 0 })
+
+    if ($git_status | is-empty) {
+        print "No changes to commit"
+        return
+    }
+
+    # Analyze changes
+    mut changes = []
+    mut files_modified = []
+    mut files_added = []
+    mut files_deleted = []
+
+    for line in $git_status {
+        let status_code = ($line | str substring 0..2)
+        let file_path = ($line | str substring 3..)
+
+        # Parse git status codes
+        match $status_code {
+            " M" => { if $analyze_unstaged { $files_modified = ($files_modified | append $file_path) } }
+            "M " => { if $analyze_staged { $files_modified = ($files_modified | append $file_path) } }
+            "MM" => { $files_modified = ($files_modified | append $file_path) }
+            "A " => { if $analyze_staged { $files_added = ($files_added | append $file_path) } }
+            "??" => { if $analyze_unstaged { $files_added = ($files_added | append $file_path) } }
+            " D" => { if $analyze_unstaged { $files_deleted = ($files_deleted | append $file_path) } }
+            "D " => { if $analyze_staged { $files_deleted = ($files_deleted | append $file_path) } }
+            _ => {}
+        }
+    }
+
+    # Get recent commit messages for style reference
+    let recent_commits = try {
+        git log --oneline -5 | lines
+    } catch {
+        []
+    }
+
+    # Analyze file types and changes
+    let config_files = ($files_modified | where { $in | str ends-with ".toml" or $in | str ends-with ".nu" or $in | str ends-with ".yaml" })
+    let core_files = ($files_modified | where { $in | str contains "core/" })
+    let provider_files = ($files_modified | where { $in | str contains "provider" })
+
+    # Generate commit message based on changes
+    mut commit_type = "chore"
+    mut commit_scope = ""
+    mut commit_description = ""
+
+    # Determine commit type and scope
+    if (not ($files_added | is-empty)) {
+        $commit_type = "feat"
+        $commit_description = "add new functionality"
+    } else if (not ($files_deleted | is-empty)) {
+        $commit_type = "refactor"
+        $commit_description = "remove unused components"
+    } else if (not ($config_files | is-empty)) {
+        $commit_type = "config"
+        $commit_scope = "system"
+        $commit_description = "update configuration settings"
+    } else if (not ($core_files | is-empty)) {
+        $commit_type = "refactor"
+        $commit_scope = "core"
+        $commit_description = "improve core functionality"
+    } else if (not ($provider_files | is-empty)) {
+        $commit_type = "feat"
+        $commit_scope = "providers"
+        $commit_description = "enhance provider capabilities"
+    } else {
+        $commit_type = "chore"
+        $commit_description = "update project files"
+    }
+
+    # Build commit message
+    mut commit_message = if ($commit_scope | is-empty) {
+        $"($commit_type): ($commit_description)"
+    } else {
+        $"($commit_type)\(($commit_scope)\): ($commit_description)"
+    }
+
+    # Add details section
+    mut details = []
+
+    if (not ($files_added | is-empty)) {
+        $details = ($details | append $"- Add: ($files_added | str join ', ')")
+    }
+
+    if (not ($files_modified | is-empty)) {
+        $details = ($details | append $"- Update: ($files_modified | str join ', ')")
+    }
+
+    if (not ($files_deleted | is-empty)) {
+        $details = ($details | append $"- Remove: ($files_deleted | str join ', ')")
+    }
+
+    # Create full commit message
+    let full_message = if ($details | is-empty) {
+        $commit_message
+    } else {
+        $"($commit_message)\n\n($details | str join '\n')"
+    }
+
+    # Write to file
+    $full_message | save $file
+
+    print $"Commit message generated and saved to: ($file)"
+    print "\nGenerated message:"
+    print "=================="
+    print $full_message
+}
+
+# Show current git changes that would be included in commit message
+export def "show-commit-changes" [] -> table {
+    let status_output = (git status --porcelain | lines | where { $in | str length > 0 })
+
+    $status_output | each { |line|
+        let status_code = ($line | str substring 0..2)
+        let file_path = ($line | str substring 3..)
+
+        let change_type = match $status_code {
+            " M" => "Modified (unstaged)"
+            "M " => "Modified (staged)"
+            "MM" => "Modified (both)"
+            "A " => "Added (staged)"
+            "??" => "Untracked"
+            " D" => "Deleted (unstaged)"
+            "D " => "Deleted (staged)"
+            _ => $status_code
+        }
+
+        {
+            file: $file_path,
+            status: $change_type,
+            code: $status_code
+        }
+    }
+}