feat(checker): examples() and spec_files() carry the specification's files

A consumer of the checker crate needs no path into this repository.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HS8WZziDnyxunC23MUxrLp

target/doc/bookspec_checker/all.html

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class="sidebar-crate"><h2><a href="../bookspec_checker/index.html">bookspec_<wbr>checker</a><span class="version">0.1.0</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h3><a href="#structs">Crate Items</a></h3><ul class="block"><li><a href="#structs" title="Structs">Structs</a></li><li><a href="#enums" title="Enums">Enums</a></li><li><a href="#constants" title="Constants">Constants</a></li><li><a href="#traits" title="Traits">Traits</a></li><li><a href="#functions" title="Functions">Functions</a></li></ul></section><div id="rustdoc-modnav"></div></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><div class="width-limiter"><section id="main-content" class="content" tabindex="-1"><div class="main-heading"><h1>List of all items</h1><rustdoc-toolbar></rustdoc-toolbar></div><h3 id="structs">Structs</h3><ul class="all-items"><li><a href="derive/struct.Derivation.html">derive::Derivation</a></li><li><a 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