The @ conversion operator was implemented but undocumented. Added a dedicated section to docs/books/src/reference/operators.md covering the operator's syntax, all supported conversion targets, and usage examples.

Changes

• docs/books/src/reference/operators.md — new Conversion Operator (@) section including:
  • Full table of supported targets (symbols: h1–h6, html, text, sh, base64, uri; strings: ">", "-", "~", URL)
  • Examples for each conversion type

Usage

"Hello World" @ h1         # => # Hello World
"Important note" @ ">"     # => > Important note
"hello world" @ sh         # => 'hello world'
"hello" @ base64           # => "aGVsbG8="
"hello world" @ uri        # => "hello%20world"
"mq" @ "https://example.com"  # => [mq](https://example.com)

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