issue-5 recommendations

[Drakaniia]

Summary

11 atomic commits covering the full scope of changes:

• deps: serde, serde_json, clap_complete
• process: process-tree termination (--tree flag), collect_process_tree
• scanner: ProcessInfo identity fields (command_line, executable_path, cwd, parent_pid), ScanReport/ScanAttempt diagnostics, process enrichment via /proc and ps
• config: JSON config file, profiles, env var resolution (MAGIC_PORTS, MAGIC_CONFIG_DIR, MAGIC_CONFIG_PATH), expanded built-in port list
• cli: config show/set-ports/set-profile, completions, --tree, --quiet, --json, JSON output for list
• tui: confirmation view with process identity, process list pagination, scan report error handling, post-kill refresh
• tests: updated and new tests across all modules
• scripts: local asset directory support for installer smoke testing
• ci: cross-platform test matrix (Ubuntu/Windows/macOS), installer smoke checks, format job
• ci: release archive validation before upload
• docs: README, installation, project-structure, release docs updated

Tested

• All changes committed cleanly with no unstaged files
• CI will run formatting, cross-platform tests, and installer smoke checks on push