Add LLM metadata stubs for allowlisted CSV sources

[weasel-lee]

Motivation

• Provide compact, orthogonal LLM-friendly semantic metadata for the crate's primary source modules to speed future model queries about behavior, invariants, and risks.
• Follow the repository allowlist rules and the provided prompt to create/update metadata for each allowlisted Rust source and skip short files.

Description

• Added metadata stubs src/*.metadata.txt for the allowlisted modules: byte_record, string_record, reader, writer, deserializer, serializer, error, lib, cookbook, and tutorial, each following the required [FILE METADATA] structure and focusing on invariants, edge cases, contracts, and risks.
• Updated .github/metadata/allowlist.txt to document the skipped short source file: src/debug.rs (files < 100 lines are intentionally omitted and recorded in the allowlist comments).
• Metadata generation followed the mapping a.rs -> a.metadata.txt and the rules from the prompt: create when missing and treat existing metadata as modified (here these are new stubs that summarize the expensive-to-derive semantics of the corresponding source files).
• Committed the new files and the allowlist update to the repository.

Testing

• No automated tests were executed for these metadata-only changes.

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Codex Task

[weasel-lee]

@codex

METADATA_JOB_REQUEST_V1

Please update Rust metadata files for this PR. Submit the result directly to GitHub (commit) without asking for toggles or confirmations.

Rules:

• Allowlist: use glob patterns from .github/metadata/allowlist.txt (supports !exclude lines).
• Output path mapping: /path/to/src/a.rs -> /path/to/src/a.metadata.txt
• Prompt: follow .github/metadata/prompt.txt exactly for output structure and style.
• Added Rust file: generate metadata from Rust source + prompt.
• Modified Rust file: update metadata using Rust source + existing metadata + prompt.
• Deleted Rust file: if corresponding .metadata.txt exists, delete it.
• Do not include housekeeping hash headers like "# source_sha256:" in your output; those are handled by tooling.

Targets:
Added:
(none)

Modified:
(none)

Deleted:
(none)

[chatgpt-codex-connector]

Summary

• No changes were required because the trigger listed no added, modified, or deleted Rust targets to update.

Testing

• Not run (no changes).

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