Add Re-attach for a relaunched same-name target

In the Terminated state the Injection panel now offers a Re-attach button: it
refreshes the process list and finds live processes whose image name matches the
original target's (case-insensitive). Exactly one match -> tear down the stale IPC
channel and inject into the new pid via the normal path; several matches -> don't
guess, filter the picker to the name and prompt the operator to pick one; none ->
report it. Saves hunting for a relaunched game's new pid in the list.

Verified: x64 build + ctest 7/7 green. Re-attach is a Terminated-state button flow,
so its end-to-end behavior is best confirmed live (ImGui clicks can't be scripted);
logic reviewed.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

README.md

@@ -75,13 +75,6 @@ is removed from this list once done — so the top item is always next. The
 self-verifiable tooling / UI / input items come first; the game-pipeline items that
 need a real game (and Remote Play) to fully validate come last.
 
-- **Re-attach to a relaunched target.** A killed-and-relaunched game gets a new pid,
-  but the UI still holds the stale one. In the Terminated state, remember the
-  target's image name (the panel already keeps the selected exe name) and offer a
-  **Re-attach** button that injects only if a live process with that *same name*
-  exists, rebinding the IPC server to the new pid via the existing `inject_dll` path.
-  If several live processes share that name, don't guess — surface the matches in the
-  window/process picker for a manual choice.
 - **Select targets by window, not just process.** A flat process list is fine as an
   advanced/debug view, but the default should be a **window list** — there are far
   fewer top-level windows than processes, and a window directly yields the HWND the