fix(sqlite): preserve chronological recall order

[KooshaPari]

Summary

• retain deterministic SHA fact identity for deduplication
• add forward schema migration with stable insertion order
• make recall/top-k chronological and preserve duplicate ordinals

Evidence

• inverse-hash recall regression: PASS
• duplicate ordinal regression: PASS
• v1 to v2 migration regression: PASS
• full SQLite library suite: 303/303 PASS
• owned Rust formatting and diff checks: PASS

Scope

SQLite memory store/schema only. Full workspace gates remain pending; this draft makes no release-readiness claim.

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