An item edit (c/d/u/p) keeps the listing's walk in front of it instead of discarding the model. bump_items now takes the edited address; rows before an edit keep their addresses and their row numbers, so only the pages from the edit onward are re-walked. Getting the listing back after undefining at the cursor on bash: 4890ms -> 19ms (257x). Adds .auto/check_edit.py to the gate. total_ms is flat — the bench has no item-edit phase, and the one I wrote hangs (reverted, cause recorded).

Result: {"status":"keep","total_ms":25783,"lg_boot_ms":777.9,"lg_decomp_ms":2381.9,"lg_graph_ms":1209.5,"lg_hex_ms":450,"lg_index_ms":68,"lg_listing_cold_ms":434.6,"lg_listing_warm_ms":405.2,"lg_nav_ms":6801.2,"lg_palette_ms":4.7,"lg_rename_ms":744.7,"lg_render_ms":222.4,"lg_search_ms":3885.6,"lg_split_ms":2261.4,"pure_graph_ms":216.4,"sm_boot_ms":463.6,"sm_decomp_ms":1304.6,"sm_graph_ms":740.9,"sm_hex_ms":438.4,"sm_index_ms":2.4,"sm_listing_cold_ms":270.3,"sm_listing_warm_ms":267.2,"sm_nav_ms":312.4,"sm_palette_ms":0.3,"sm_rename_ms":415.8,"sm_render_ms":257.7,"sm_search_ms":60.8,"sm_split_ms":1385.2,"fails":0}

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