refactor: create check.go, use flagrun and seferio

[kazeburo]

PR Type

Enhancement, Bug fix

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Description

• Extracts command checking into check.go

• Replaces custom CLI parsing with flagrun

• Uses safer file access and argument validation

• Updates tests and dependencies for refactoring

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Diagram Walkthrough

flowchart LR
  CLI["flagrun CLI"] --> RUN["Opt.Run"]
  RUN --> CHECK["Opt.check"]
  CHECK --> EXEC["Execute command"]
  CHECK --> SAFE["Read stored results via saferio"]
  CHECK --> RESULT["Return checker status"]

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File Walkthrough

	Relevant files
Enhancement	2 files check.go Extract command checking implementation                                    +97/-0    main.go Integrate flagrun command execution                                            +7/-139
Tests	1 files check_test.go Update tests for check method                                                        +8/-8
Bug fix	1 files diff.go Harden stored result file reads                                                    +16/-14
Miscellaneous	2 files open_unix.go Remove custom Unix file opener                                                      +0/-15    open_windows.go Remove custom Windows file opener                                                +0/-12
Configuration changes	1 files Makefile Simplify build metadata configuration                                        +2/-3
Dependencies	1 files go.mod Add flagrun and saferio dependencies                                          +2/-0

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[github-actions]

PR Reviewer Guide 🔍

(Review updated until commit 7abe5da)

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 2 🔵🔵⚪⚪⚪

🧪 PR contains tests

🔒 No security concerns identified

⚡ No major issues detected

[github-actions]

Persistent review updated to latest commit bdb68fc

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

Persistent review updated to latest commit 7abe5da