🐛 fix(xsct): TCL file instead of -eval, add ps7_init, remove broken Vivado ELF path

Fixes found during real hardware test:

bitstream_programmer.py:
- _program_with_xsct: use TCL file instead of xsct -eval (quit→exit fix)
- _run_elf_with_xsct: add reconnect + source ps7_init.tcl after PL config,
  use target ID 2 instead of name filter, TCL file instead of -eval
- _find_ps7_init_tcl: auto-detect ps7_init.tcl from BIT file directory
- run_elf: remove Vivado fallback (program_hw_cpu is xsct, not Vivado)
- Remove dead _run_elf_with_vivado (Vivado HM can't program PS CPU)

flash_programmer.py:
- wipe_flash: -erase_only without -erase_all (s25fl256s1 compat fix)

src/flash_programmer.py

@@ -99,10 +99,11 @@ def wipe_flash(
     config: Config,
     callback: ProgressCallback = None,
 ) -> FlashResult:
-    """Erase the entire QSPI flash using program_flash.
+    """Erase QSPI flash sectors matching the bootloader image size.
 
-    Uses -erase_all -erase_only to perform a full-chip erase without
-    writing new data.
+    Uses -erase_only to erase only the sectors covered by the BIN file.
+    Avoids -erase_all which fails on some flash chips (e.g. s25fl256s1)
+    that don't report memory density information.
 
     Args:
         config: Application configuration (needs fsbl_elf_path).
@@ -131,7 +132,7 @@ def wipe_flash(
         callback("start", "Erasing QSPI flash...")
 
     cmd = _build_program_flash_cmd_base(flash_tool, config)
-    cmd += ["-erase_all", "-erase_only"]
+    cmd += ["-erase_only"]  # Erase sectors matching the BIN size (safer than -erase_all)
 
     try:
         result = _run_command(cmd, timeout=300, callback=callback)