feat: add CodeWhale ingestion adapter for Moraine memory backend

[cy2311]

Summary

Add CodeWhale ingestion adapter for Moraine memory backend (ref: Hmbown/Codewhale#3495).

Changes

• codewhale.rs — 610-line IngestSource implementation handling CodeWhale content-parts: text / thinking / tool_use / tool_result
• mod.rs — register codewhale in SourceRegistry
• config — add codewhale to KNOWN_INGEST_HARNESSES + default_sources()
• Tests — 10 integration tests (all pass)
• Fixture — redacted real CodeWhale session JSON

[chatgpt-codex-connector]

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