Add a focused regression for Python scoped overlay/exact behavior when receiver-method calls need broader resolver context. The test keeps overlay_publish=small_deltas on, edits one Python file, and asserts the production scoped_lsp_gap path falls back to full reindex, avoids replacement overlay publication, preserves the expected CALLS target, and matches a fresh FAST rebuild.
Also correct stale cross-LSP comments so the code describes the current split between full FAST fused cross-LSP, sequential changed-file cross-LSP, and parallel scoped no-op cross-LSP.
Signed-off-by: Andrew Hundt <ATHundt@gmail.com>