chore: Make CLI command-based

[martinnaj]

Risk: low

Summary by CodeRabbit

• New Features
  • Added detect, list-projects, and version commands, with command-specific help and validated flags.
  • detect supports target filtering, commit or branch comparisons, optional CSS and type analysis, and logging-level selection.
  • Added top-level version aliases; Docker runs detect by default.
• Changes
  • Detection output is sorted JSON. Bare invocation now displays usage and exits with an error.
  • Environment-variable inputs and the --list option are no longer supported; use command flags instead.
• Bug Fixes
  • Deleted exports now affect only the corresponding symbols rather than tainting an entire file.

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📥 Commits

Reviewing files that changed from the base of the PR and between de5fe1b and 1223d06.

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📒 Files selected for processing (12)

• CHANGELOG.md
• Dockerfile
• README.md
• VERSION
• cmd/detect/detect.go
• cmd/list_projects/list_projects.go
• cmd/version/version.go
• internal/cli/help.go
• internal/cli/parse.go
• internal/cli/types.go
• internal/cli/validate.go
• main.go

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