✨ feat(mq-run): auto-parse structured files by extension when no input format is specified

[harehare]

When -I is not given, automatically prepend the appropriate module import and parse call based on the file extension:

• .json → import "json" | json::json_parse()
• .yaml/.yml → import "yaml" | yaml::yaml_parse()
• .toml → import "toml" | toml::toml_parse()
• .xml → import "xml" | xml::xml_parse()
• .toon → import "toon" | toon::toon_parse()
• .csv → import "csv" | csv::csv_parse(true)
• .tsv → import "csv" | csv::tsv_parse(true)
• .psv → import "csv" | csv::psv_parse(true)

[Copilot]

Pull request overview

This PR adds mq-run behavior to automatically parse structured input files based on file extension when -I/--input-format is not specified, plus related CLI/help and reference documentation.

Changes:

• Adds extension-to-query-prefix auto parsing for JSON, YAML, TOML, XML, Toon, CSV, TSV, and PSV inputs.
• Prepends the generated import/parse query before executing user queries.
• Documents built-in parsing modules and adds unit/CLI tests for selected auto-parse behavior.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
crates/mq-run/src/cli.rs	Adds CLI help text, auto-query-prefix logic, execution integration, and tests.
docs/books/src/reference/modules_and_imports.md	Adds reference documentation for built-in parsing modules and links to CLI auto-parsing docs.

Comments suppressed due to low confidence (1)

crates/mq-run/src/cli.rs:585

• Auto-parsing is applied even in --stream mode, where execute receives one line at a time. That makes multi-line .json/.yaml/.toml files fail because each individual line is sent to the structured parser, and it also makes .csv headers unavailable to later rows. Disable the prefix for streaming input or only apply it when the parser sees the full file content.

        let query = match self.auto_query_prefix(file) {
            Some(prefix) => {
                effective_query = format!("{} | {}", prefix, query);