feat: replace import flags with --query for GitHub search syntax

[Copilot]

Replaces --user, --org, --repo, and all filter flags (--skip-*, --include-*) with a single --query option that accepts GitHub search syntax.

Changes

• Import command: Added --query/-q option using octocrab's SearchHandler
• Removed flags: --user, --org, --repo, --skip-forks, --skip-private, --skip-internal, --skip-public, --include-archived
• Validation: --query and positional repository arguments are mutually exclusive with clear error messages
• Removed code: RepoFilters struct and should_skip_repo function no longer needed

Usage

# Query-based import
nut import -q "owner:stefreak language:rust -fork:true"
nut import -q "org:actions language:JavaScript,TypeScript -archived:true"

# Positional args still supported
nut import owner/repo1 owner/repo2

# Mutual exclusivity enforced
nut import -q "language:rust" owner/repo  # Error: use one or the other

Query syntax matches github.com/search.

Documentation

Updated README.md with query examples and removed references to deprecated flags.

Original prompt

Create a new option --query or -q allowing users to import all repositories matching a certain pattern.
Remove the options --user, --org, --repo, --skip-* and --include-* in favor of this one option.

Use the octocrab SearchHandler to implement it:

let page = octocrab::instance()
    .search()
    .repositories("tetris language:rust")
    .send()
    .await?;

The --query option is mutually exclusive with providing full repository names as positional arguments to the import command.

Update the docs to reflect the new commands and functionality

Examples:

nut import -q "owner:stefreak language:rust -fork:true"
nut import -q "org:actions language:JavaScript,TypeScript -archived:true"

This should fail with a good error message, as positional args and --query are mutually exclusive:

nut import -q "language:rust" stefreak/nut

Mention in the docs that you can use the same syntax as in the search bar on github.com (e.g. https://github.com/search?q=org%3Agithub%20language%3ATypeScript&type=repositories)

Optional: Write tests that import public repos from the user stefreak; I believe this should be possible with your available github token and it should even be possible anonymously?

Custom agent used: Señora Nut Engineer
Software Engineering Agent

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