Retire IMPLEMENTATION_BUGS_AND_RESOLUTIONS.md or fold it into the conformance statement #169

Problem

IMPLEMENTATION_BUGS_AND_RESOLUTIONS.md is a bug-by-bug narrative from the design phase. It still names the project turso-java and describes intermediate states that later PRs changed (for example the transaction lifecycle was rewritten in #99/#152 and now lives in AGENTS.md §2 and the conformance divergences).

Its still-valuable content — the why behind the remote-model compromises (one-shot close, lazy begin, baton rotation, no hidden session stream) — is already largely captured in AGENTS.md and upstream-xerial_sqlite-jdbc.manifest. What remains unique is a handful of performance notes (Jackson databind vs. DirectHranaJsonCodec, column-lookup hashing, parameter storage).

Proposed change

Fold the still-relevant divergence rationale into the canonical conformance statement (see the conformance-statement subissue) and delete the rest. Alternatively retitle and trim it to a short "design rationale" document. Recommend folding plus deleting.

Acceptance criteria

• The document no longer references turso-java.
• Its surviving rationale lives in exactly one canonical place, not duplicated across three documents.