test(sync): exercise refresh through adapter seam

[samzong]

What changed?

• Inject the existing store, config, and adapter set into SyncJob so production and tests use the same execution path.
• Cover changed-session refresh through the adapter-to-store path.
• Remove three regression tests that did not execute sync behavior.

Why

• Protect sync orchestration with one behavior-level test without adding a new abstraction or mock framework.

Verification

• cargo fmt --all -- --check
• cargo clippy --workspace --all-targets -- -D warnings
• cargo test -p recall --lib (331 passed)
• make check reaches the unchanged recall-reflect CLI tests; two fail on macOS because /var and /private/var are compared without path normalization.