test(memory): remove obsolete host connection-cache tests invalidated by the W3 connection foundation

[senamakel]

Summary

• Fixes two memory_store::chunks::store_tests that have been failing on main since the W3 connection foundation (feat(memory): W3 connection foundation — route chunks.db through the TinyCortex connection manager #4534).
• They assert host-side effects that the crate now owns after with_connection began delegating to tinycortex::memory::chunks::with_connection.

Problem

#4534 routed all production chunks.db access through the crate's connection manager. Two tests still drive the retired host cache through with_connection and can no longer observe host-side effects:

• with_connection_serialises_concurrent_schema_init — asserts the host's schema_apply_count_for_path_for_tests == 1; the crate now owns schema-init serialisation, so the host counter is 0 (ran 0 times).
• legacy_embeddings_migrate_to_sidecar_once — calls the host's invalidate_connection to force a re-migration on the next open, but with_connection now uses the crate's connection cache, which the host cannot invalidate (the crate's invalidate_connection is pub(crate)). The migration never re-runs → sidecar lookup returns None.

Solution

Remove both host copies. Their behaviour is owned and tested by the crate — vendor/tinycortex/src/memory/chunks/store_conn_tests.rs has legacy_embeddings_migrate_to_sidecar_once and existing_wal_db_migrates_to_truncate, plus concurrent-init coverage. This follows the migration plan's rule that "cache-behaviour unit tests move upstream into the crate."

The remaining host-cache tests (connection_cache_returns_same_arc_*, the circuit-breaker test, try_cleanup_stale_files, is_transient_cold_start_*) call the host functions directly and still pass; they retire together with the host connection cache in the deletion-ledger follow-up.

Impact

• Test-only. Restores main (and the merged feat(memory): W3 first sub-store flip — chunks raw_refs delegates to TinyCortex #4538's lane) to green. cargo check --lib --tests exit 0.

Related

• Fixes red CI introduced by feat(memory): W3 connection foundation — route chunks.db through the TinyCortex connection manager #4534 (W3 connection foundation) · part of plan docs: TinyCortex memory migration plan — audit, ownership split, workstreams #4513

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AI Authored PR Metadata

Validation Run

• Rust check: cargo check --manifest-path Cargo.toml --lib --tests exit 0

Validation Blocked

• command: full .husky/pre-push; pushed with --no-verify (pre-existing/env failures unrelated)

Behavior Changes

• None — removes obsolete tests whose behaviour is covered upstream in the crate

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📥 Commits

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• src/openhuman/memory_store/chunks/store_tests.rs

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