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/arrayvec-5517acc43f00f686/invoked.timestamp

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+This file has an mtime of when this was started.

target/debug/.fingerprint/arrayvec-5517acc43f00f686/lib-arrayvec

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+de0974c6e21135a3

target/debug/.fingerprint/arrayvec-5517acc43f00f686/lib-arrayvec.json

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+{"rustc":11835527281324007204,"features":"[\"std\"]","declared_features":"[\"borsh\", \"default\", \"serde\", \"std\", \"zeroize\"]","target":12564975964323158710,"profile":2579911162000070427,"path":1997461366183035998,"deps":[],"local":[{"CheckDepInfo":{"dep_info":"debug/.fingerprint/arrayvec-5517acc43f00f686/dep-lib-arrayvec","checksum":false}}],"rustflags":[],"config":9396254390672932401,"compile_kind":0}