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/trait.impl/core/fmt/trait.Debug.js

@@ -0,0 +1,9 @@
+(function() {
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core::fmt::Debug\">Debug</a> for <a class=\"struct\" href=\"bookspec_checker/schema/struct.Event.html\" title=\"struct bookspec_checker::schema::Event\">Event</a>",0],["impl <a class=\"trait\" href=\"https://doc.rust-lang.org/1.99.1/core/fmt/trait.Debug.html\" title=\"trait core::fmt::Debug\">Debug</a> for <a class=\"enum\" href=\"bookspec_checker/schema/enum.EventKind.html\" title=\"enum bookspec_checker::schema::EventKind\">EventKind</a>",0],["impl <a class=\"trait\" href=\"https://doc.rust-lang.org/1.99.1/core/fmt/trait.Debug.html\" title=\"trait core::fmt::Debug\">Debug</a> for <a class=\"struct\" href=\"bookspec_checker/schema/struct.Example.html\" title=\"struct bookspec_checker::schema::Example\">Example</a>",0],["impl <a class=\"trait\" href=\"https://doc.rust-lang.org/1.99.1/core/fmt/trait.Debug.html\" title=\"trait core::fmt::Debug\">Debug</a> for <a class=\"struct\" href=\"bookspec_checker/schema/struct.Expect.html\" title=\"struct bookspec_checker::schema::Expect\">Expect</a>",0],["impl <a class=\"trait\" href=\"https://doc.rust-lang.org/1.99.1/core/fmt/trait.Debug.ht
Line truncated
+    if (window.register_implementors) {
+        window.register_implementors(implementors);
+    } else {
+        window.pending_implementors = implementors;
+    }
+})()
+//{"start":59,"fragment_lengths":[11765,823]}

target/doc/trait.impl/core/fmt/trait.Display.js

@@ -0,0 +1,9 @@
+(function() {
+    const implementors = Object.fromEntries([["bookspec_checker",[["impl <a class=\"trait\" href=\"https://doc.rust-lang.org/1.99.1/core/fmt/trait.Display.html\" title=\"trait core::fmt::Display\">Display</a> for <a class=\"struct\" href=\"bookspec_checker/engine/struct.RuleId.html\" title=\"struct bookspec_checker::engine::RuleId\">RuleId</a>",0],["impl <a class=\"trait\" href=\"https://doc.rust-lang.org/1.99.1/core/fmt/trait.Display.html\" title=\"trait core::fmt::Display\">Display</a> for <a class=\"struct\" href=\"bookspec_checker/engine/struct.RuleIdError.html\" title=\"struct bookspec_checker::engine::RuleIdError\">RuleIdError</a>",0],["impl <a class=\"trait\" href=\"https://doc.rust-lang.org/1.99.1/core/fmt/trait.Display.html\" title=\"trait core::fmt::Display\">Display</a> for <a class=\"struct\" href=\"bookspec_checker/schema/struct.SchemaError.html\" title=\"struct bookspec_checker::schema::SchemaError\">SchemaError</a>",0]]]]);
+    if (window.register_implementors) {
+        window.register_implementors(implementors);
+    } else {
+        window.pending_implementors = implementors;
+    }
+})()
+//{"start":59,"fragment_lengths":[904]}