The @ operator and convert() function lacked integration tests in integration_tests.rs, leaving the full evaluation path untested despite thorough unit tests in convert.rs.

Changes

• Integration tests (crates/mq-lang/tests/integration_tests.rs): Added 14 test cases following the shift-operator pattern, covering:
  • convert() function call form
  • @ operator with heading symbols (:h1, :h2) and string markers ("#", "##")
  • @ operator with encoding targets: :base64, :uri, :urid, :sh
  • @ operator with Markdown structure targets: ">", "-", "~~", "**", "--"

// Examples of the new test cases
"\"Hello\" @ :h1"         // → Heading { depth: 1, values: ["Hello"] }
"\"text\" @ :base64"      // → String("dGV4dA==")
"\"hello world\" @ :uri"  // → String("hello%20world")
"\"Hello\" @ \">\""       // → Blockquote { values: ["Hello"] }

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