app: non-function regions — open a flat listing + c/p/u edit verbs (M0)

Navigating to an address not inside a function no longer refuses ("no
function contains X"): _do_navigate now opens a region view (flat listing
anchored at the EA, forced to disasm since there's no pseudocode). The
server's no-function disasm already walks heads to the segment end, so
DisasmModel is reused as-is; NavEntry gains is_region.

Adds the IDA c/p/u structure-edit verbs on the disasm view:
  c = define_code (undefine-first, since create_insn won't carve a live item)
  p = define_func
  u = undefine
wired via EditItemRequested -> _do_edit_item worker -> Program.define_code/
define_func/undefine. define_func upgrades the region to a real function
view in place.

New Program.bump_items() invalidates the item/function structure caches
(disasm blocks, decomp, function indices + name gen) — broader than
bump_names(), which only covers renames.

Pilot: new `region_define` scenario undefines a small function, navigates
to the bare region via the 'g' prompt (asserts it opens, not refused),
then 'p' recreates the function and upgrades the view; restores the IDB in
a finally. 107 passed / 1 pre-existing flaky (filter, fails on baseline).

1 files changed, 7 insertions, 2 deletions

diff --git a/TODO b/TODO
index d9245e1..a1ff814 100644
--- a/TODO
+++ b/TODO
@@ -15,8 +15,13 @@ doable:
 
 hard:
 [ ] deal with PLT stubs and such (oh god here we go)
-[ ] how to deal with non-function-body regions?
-    -> we want to be able to do data/type definitions in .data etc. 
+[~] how to deal with non-function-body regions?
+    -> we want to be able to do data/type definitions in .data etc.
+    -> M0 done: navigating to a non-function EA opens a flat listing (region)
+       instead of refusing; c/p/u edit verbs on the disasm view (define code /
+       function / undefine) with bump_items() cache invalidation + region->func
+       upgrade. next: M1 server `heads` walker + ListingModel (address paging),
+       M2 ListingView (code+data render), M3 data typing in .data.
 
 crazy:
 [ ] multi/split view ala ghidra?