Get rid of sandbox manifest files

[jviotti]

Signed-off-by: Juan Cruz Viotti jv@jviotti.com

[augmentcode]

🤖 Augment PR Summary

Summary: This PR removes the previous “sandbox manifest” workflow and replaces it with CLI-level regression tests that validate the generated sandbox/index output structure.

Changes:

• Removed the sandbox manifest check step from Makefile and deleted the sandbox-manifest-refresh target.
• Dropped the Docker-based sandbox manifest validation by removing the copied manifest files and manifest-check.sh from test/sandbox/Dockerfile.
• Deleted test/sandbox/manifest-check.sh and legacy manifest snapshot files under test/sandbox.
• Added a set of new CLI tests under test/cli/index/common that build an index, enumerate the output via find | sort, and diff against an expected manifest.
• Registered the new tests in test/cli/CMakeLists.txt to cover scenarios like default vs headless output, filename edge cases (camelcase, periods, index.html, versions), URL-encoding (%25), YAML schemas, missing $id, and path overlaps/clashes.

Technical Notes: The new tests exercise output determinism by comparing full directory/file manifests, shifting validation from pre-generated snapshot files to reproducible, configuration-driven test fixtures.

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