fix(mcp): warn on unmet quantities rather than sheet ratio

docs/automatic-nesting.md

@@ -48,7 +48,7 @@ Invalid output is printed and rejected with exit code 2 without saving or postin
 
 MCP `autonest_plate` requires an empty target. The stdio server serializes all tool calls sharing its mutable session, so another request cannot change drawings or occupy a target during a solve. `allow_invalid` defaults to false. It reports violations and makes no changes on rejection, including with an override when the output is unrepresentable or contains multiple sheets. `engine` defaults to Default, and its description lists the built-in engines with what each suits. Fill tools (`fill_plate`, `fill_area`, `fill_remnants`, `pack_plate`) remain separate and default to the Fill strategy. Console and MCP load jobs plug-ins from `Engines/` beside their executable.
 
-MCP `pack_plate` and `autonest_plate` report each requested drawing's newly placed count and remaining ceiling, indexed by request; a skewed positive-demand mix gets an explicit `ratio not met` warning. This is reporting, not proportional packing: both tools still choose the same density-first layout. Duplicate request tokens and ambiguous drawing names are refused before placement. A zero-quantity pack request places zero parts for that drawing; negative quantities are rejected, and neither has a meaningful proportional mix. A partially placed balanced mix can still leave demand unfilled. Strict per-sheet ratio enforcement is not available yet.
+MCP `pack_plate` and `autonest_plate` report each requested drawing's newly placed count and remaining quantity, indexed by request; partial fulfillment is explicitly warned about. Per-sheet ratios are not enforced or required: an uneven sheet is acceptable if the remaining quantities are placed elsewhere in the nest. These tools operate on a single selected plate and do not yet automatically finish a multi-sheet job; callers must track and place the outstanding quantities. Duplicate request tokens and ambiguous drawing names are refused before placement. A zero-quantity pack request places zero parts for that drawing; negative quantities are rejected.
 
 MCP `delete_plate(plateIndex)` removes only a sheet with no parts and no cutoff definitions, from either loaded or newly created session plates. Occupied, cutoff-bearing and invalid indices are refused without changing the session. After deletion every later index shifts down by one; inspect `get_plate_info` before further edits. This is session cleanup, not a data purge or a save-time option. `save_nest` lists all session plates in its response, but the existing `.nest` writer omits empty cutoff-free plates from the serialized file; reloading may therefore have fewer plates than the response says. There is no opt-in switch to preserve empty plates in the file.