Add segment coverage ledger and mid-project plan for Crusader decompilation

- Created `crusader_segment_coverage_ledger.csv` to track segment coverage status, types, and known functions.
- Introduced `plan-mid.md` as a mid-project tracker outlining progress, objectives, and implementation priorities for the decompilation effort.
- Added scripts in `pyghidra_plans` to assist with instruction window dumping and reference inspection for the object at `0x4588`.
- Implemented functionality to scan for instruction uses of specific targets related to the decompilation project.

pyghidra_plans/dump_instruction_windows.py

@@ -0,0 +1,76 @@
+TARGETS = [
+    "0004:5b8c",
+    "0004:5bbf",
+    "0004:5ea7",
+    "0004:6430",
+    "0009:92ad",
+    "0009:b1cd",
+    "000a:493e",
+    "000a:4a68",
+    "000a:b9e5",
+    "000a:ba66",
+    "000d:9d5e",
+    "000d:a3b7",
+]
+
+BEFORE_COUNT = 6
+AFTER_COUNT = 8
+
+
+listing = program.getListing()
+address_factory = program.getAddressFactory()
+
+
+def as_address(text):
+    segment_text, offset_text = text.split(":")
+    return address_factory.getAddress(f"{segment_text}:{offset_text}")
+
+
+def collect_window(center):
+    instructions = []
+
+    current = listing.getInstructionContaining(center)
+    if current is None:
+        current = listing.getInstructionAt(center)
+    if current is None:
+        current = listing.getInstructionBefore(center)
+        if current is not None and current.getNext() is not None and current.getNext().getAddress() <= center:
+            current = current.getNext()
+    if current is None:
+        return instructions
+
+    cursor = current
+    for _ in range(BEFORE_COUNT):
+        cursor = cursor.getPrevious()
+        if cursor is None:
+            break
+    if cursor is None:
+        cursor = current
+        while cursor.getPrevious() is not None and len(instructions) < BEFORE_COUNT:
+            cursor = cursor.getPrevious()
+
+    while cursor is not None:
+        instructions.append(cursor)
+        if cursor == current:
+            break
+        cursor = cursor.getNext()
+
+    cursor = current.getNext()
+    while cursor is not None and len(instructions) < BEFORE_COUNT + AFTER_COUNT + 1:
+        instructions.append(cursor)
+        cursor = cursor.getNext()
+
+    return instructions
+
+
+for target_text in TARGETS:
+    target = as_address(target_text)
+    print(f"=== {target} ===")
+    window = collect_window(target)
+    if not window:
+        print("<no instruction window>\n")
+        continue
+    for insn in window:
+        marker = "=>" if insn.getAddress() == target else "  "
+        print(f"{marker} {insn.getAddress()} {insn}")
+    print("")