Fix Knowledge Apollo model compatibility with legion-data schema cleanup

[Esity]

Summary

• Add a Knowledge Apollo-model resolver that prefers Legion::Data::Model::Apollo::* classes from the legion-data schema cleanup.
• Preserve fallback compatibility with legacy Apollo entry/access-log constants.
• Rewire ingest and maintenance model access through the resolver.
• Add neighbor retrieval expansion for query and retrieve flows.
• Add optional ingest chunk filtering with prompt and threshold settings.
• Uplift Knowledge defaults, logging, settings, exception handling, and JSON persistence to use Legion helper APIs end to end.
• Bump version to 0.6.14 and update the changelog.

Validation

• bundle exec rspec --format json --out tmp/rspec_results.json --format progress --out tmp/rspec_progress.txt
• bundle exec rubocop -A
• Static scans for direct ::JSON, raw JSON.*, direct settings lookup, direct logging calls, settings_ shims, def log, and unresolved conflict markers.

Related

• Fixes Neighbor chunk expansion on retrieval hits #10
• Fixes LLM-based ingest filter (filter_prompt) for noise reduction #7
• Add portable LLM and identity schema models legion-data#39