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/debug/.fingerprint/toml_writer-91c03a596f243944/invoked.timestamp

@@ -0,0 +1 @@
+This file has an mtime of when this was started.

target/debug/.fingerprint/toml_writer-91c03a596f243944/lib-toml_writer

@@ -0,0 +1 @@
+85034c370b4ba9b6

target/debug/.fingerprint/toml_writer-91c03a596f243944/lib-toml_writer.json

@@ -0,0 +1 @@
+{"rustc":11835527281324007204,"features":"[\"alloc\", \"std\"]","declared_features":"[\"alloc\", \"default\", \"std\"]","target":17154059384684657001,"profile":10022867059850265794,"path":12917080932119308747,"deps":[],"local":[{"CheckDepInfo":{"dep_info":"debug/.fingerprint/toml_writer-91c03a596f243944/dep-lib-toml_writer","checksum":false}}],"rustflags":[],"config":9396254390672932401,"compile_kind":0}