test: replace obsolete model integration suites

[saagpatel]

Refs #44.

What changed

• Replace the obsolete integration suite that referenced removed HNSW and ONNX Embedder modules.
• Exercise current indexing/search through run_index_shared, Store, sqlite-vec, and MockLlm.
• Exercise create, append, immediate searchability, incremental add/change/delete behavior, and mtime-conflict rejection without model downloads.

Why

The existing files were marked ignored, but they no longer compiled under cargo test --all-targets because their backend APIs were deleted during the sqlite-vec/llama.cpp migrations. Deleting them would hide the coverage loss; this updates the tests to the current architecture instead.

Impact

Five integration tests now run locally without network or model dependencies, and all targets compile again.

Validation

• cargo fmt --check
• cargo clippy -- -D warnings
• cargo test --test integration --test write_pipeline — 5 passed
• cargo test --all-targets --no-run — passed

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Assert the appended content is indexed

In this test the note at created.path was already indexed by create_note before the append, and the harness has no competing notes; search_internal's semantic lane can return that same file for any query even if append_to_note never re-indexes the appended text. This lets a stale index pass the test; assert that the returned snippet/content contains the appended phrase, or add a competing document and require the updated note to rank first, so the test actually covers the index update.

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