Define logo quality and scope policy

[Millbot-AI]

What changed

• add LOGO_QUALITY_POLICY.md as the human-readable quality and scope contract
• add logo_quality_policy.json as the machine-readable policy for later QA gates
• link both policy artifacts from the README

Why

This establishes the first roadmap item for unattended logo curation: immutable
raw sources, fail-closed processing, deterministic repairs, transparent outputs,
explicit Light/Dark handling, hard fidelity gates, and quarantine instead of
forced conversion.

The policy also records the project decision that per-file attribution,
individual license validation, and copyright/trademark gates are outside this
pipeline.

Impact

Later source ingestion, QA, restoration, master promotion, and export work can
refer to one versioned policy. The change does not modify any logo assets or
existing downloader work.

Validation

• jq empty logo_quality_policy.json
• required-policy assertions with jq -e
• git diff --cached --check

Scope safety

Only the policy Markdown, machine-readable JSON, and README link are included.
Existing uncommitted Wikimedia downloader files remain untouched.

[Millbot-AI]

Closed because the unattended curation process will remain local and confidential until the curated logo set is ready for publication.