Claims now flow through StemeDB's append-only knowledge graph instead of
mutable TOML files. This resolves all 6 critical claim-bypass code paths:
- Bridge: lossless AuthoredClaim ↔ Assertion round-trip (comparison, status, lifecycle mapping)
- LocalEpisteme: ingest_authored_claim() and fetch_authored_claims() with AUTHORED_CLAIM predicate index
- EpistemeClaimStore: ClaimStore trait backed by StemeDB (append-only delete via deprecation)
- CLI handlers: all claim commands read/write through StemeDB
- Scanner: loads claims from StemeDB with auto-migration fallback to TOML
- Export: new `aphoria claims export` serializes StemeDB claims to TOML/JSON
Also cleans up dead code (EpistemeConfig.url), renames ingest_claims→ingest_observations,
fixes ClaimFilter.authority_tier type, adds Draft variant to ClaimStatus, and fixes
pre-existing clippy warnings (too_many_arguments, filter_next→rfind).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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