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/serde_json-56a502f57c71db72/invoked.timestamp

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

target/debug/.fingerprint/serde_json-56a502f57c71db72/lib-serde_json

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+e8bcb1b2c355692d

target/debug/.fingerprint/serde_json-56a502f57c71db72/lib-serde_json.json

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+{"rustc":11835527281324007204,"features":"[\"default\", \"std\"]","declared_features":"[\"alloc\", \"arbitrary_precision\", \"default\", \"float_roundtrip\", \"indexmap\", \"preserve_order\", \"raw_value\", \"std\", \"unbounded_depth\"]","target":9592559880233824070,"profile":2479888663174618594,"path":14498023926389699504,"deps":[[5532778797167691009,"itoa",false,2902290988924533301],[8160210889872729633,"build_script_build",false,13411333208100935620],[11029742160753049355,"serde_core",false,7622725113838073075],[12613788554453945248,"memchr",false,422465673676642652],[16226529040278277557,"zmij",false,16945741237658862989]],"local":[{"CheckDepInfo":{"dep_info":"debug/.fingerprint/serde_json-56a502f57c71db72/dep-lib-serde_json","checksum":false}}],"rustflags":[],"config":9396254390672932401,"compile_kind":0}