refactor: replace all config.vitis_path with config.xilinx_path across codebase

Affected files:
- flash_programmer.py (2 call sites) — get_program_flash_path
- bitstream_programmer.py (3 get_xsct_path + 1 get_vivado_path call sites)
  Also: removed duplicate _get_vivado_path() (now uses shared one from vitis_checker)
  Also: removed unused shutil import
- reboot_manager.py (1 call site) — get_xsct_path

All now use getattr(config, 'xilinx_path', '') consistently.
The only remaining 'config.vitis_path' reference is in vitis_checker.py's
check_vitis() itself (safe legacy fallback for old configs).

src/bitstream_programmer.py

@@ -11,14 +11,13 @@ Compatible with Xilinx 2018.3 — 2023.2.
 from __future__ import annotations
 
 import os
-import shutil
 import subprocess
 from dataclasses import dataclass
 from pathlib import Path
 from typing import Callable
 
 from config_manager import Config
-from vitis_checker import get_xsct_path
+from vitis_checker import get_xsct_path, get_vivado_path
 
 # ── Types ───────────────────────────────────────────────────────────
 
@@ -38,35 +37,6 @@ ProgressCallback = Callable[[str, str], None] | None
 # ── Helpers ─────────────────────────────────────────────────────────
 
 
-def _get_vivado_path(vitis_path: str) -> str | None:
-    """Find the Vivado executable.
-
-    Uses shutil.which() for PATH resolution, then common install paths.
-
-    Args:
-        vitis_path: Optional Vitis installation directory.
-
-    Returns:
-        Path to vivado executable, or None.
-    """
-    found = shutil.which("vivado")
-    if found:
-        return found
-    if vitis_path:
-        candidate = Path(vitis_path) / "bin" / "vivado"
-        if candidate.is_file():
-            return str(candidate)
-    common = [
-        "/data/xilinx/Vivado/2023.2/bin/vivado",
-        "/opt/xilinx/bin/vivado",
-        os.path.expanduser("~/Xilinx/Vivado/2023.2/bin/vivado"),
-    ]
-    for p in common:
-        if os.path.isfile(p):
-            return p
-    return None
-
-
 def _find_ps7_init_tcl(config: Config) -> str:
     """Find the ps7_init.tcl file for PS initialization.
 
@@ -167,16 +137,15 @@ def program_bitstream(
 
     # Try xsct first (preferred)
     xsct = get_xsct_path(
-        vitis_path=config.vitis_path if hasattr(config, 'vitis_path') else "",
-        xilinx_root=config.xilinx_path if hasattr(config, 'xilinx_path') else "",
+        xilinx_root=getattr(config, "xilinx_path", ""),
     )
     if xsct:
         timeout = config.step_timeouts.get("bitstream", 60)
         return _program_with_xsct(xsct, bit_path, callback, ps7_tcl, timeout)
 
     # Fallback to Vivado
-    vivado = _get_vivado_path(
-        config.vitis_path if hasattr(config, 'vitis_path') else ""
+    vivado = get_vivado_path(
+        xilinx_root=getattr(config, "xilinx_path", ""),
     )
     if vivado:
         return _program_with_vivado(vivado, bit_path, callback)
@@ -364,8 +333,7 @@ def run_elf(
         callback("start", f"Running ELF: {elf_path.name}...")
 
     xsct = get_xsct_path(
-        vitis_path=config.vitis_path if hasattr(config, 'vitis_path') else "",
-        xilinx_root=config.xilinx_path if hasattr(config, 'xilinx_path') else "",
+        xilinx_root=getattr(config, "xilinx_path", ""),
     )
     if not xsct:
         return BitstreamResult(
@@ -579,8 +547,7 @@ def full_bitstream_program(
                 message=f"FSBL not found: {fsbl_path or '(not configured)'}")]
 
     xsct = get_xsct_path(
-        vitis_path=config.vitis_path if hasattr(config, 'vitis_path') else "",
-        xilinx_root=config.xilinx_path if hasattr(config, 'xilinx_path') else "",
+        xilinx_root=getattr(config, "xilinx_path", ""),
     )
     if not xsct:
         return [BitstreamResult(step="bitstream", success=False,

src/flash_programmer.py

@@ -113,8 +113,7 @@ def wipe_flash(
         FlashResult with status.
     """
     flash_tool = get_program_flash_path(
-        vitis_path=config.vitis_path if hasattr(config, 'vitis_path') else "",
-        xilinx_root=config.xilinx_path if hasattr(config, 'xilinx_path') else "",
+        xilinx_root=getattr(config, "xilinx_path", ""),
     )
     if not flash_tool:
         return FlashResult(
@@ -229,8 +228,7 @@ def program_flash_bin(
         )
 
     flash_tool = get_program_flash_path(
-        vitis_path=config.vitis_path if hasattr(config, 'vitis_path') else "",
-        xilinx_root=config.xilinx_path if hasattr(config, 'xilinx_path') else "",
+        xilinx_root=getattr(config, "xilinx_path", ""),
     )
     if not flash_tool:
         return FlashResult(

src/reboot_manager.py

@@ -186,8 +186,7 @@ def reboot_via_jtag(
     from vitis_checker import get_xsct_path
 
     xsct = get_xsct_path(
-        vitis_path=config.vitis_path if hasattr(config, 'vitis_path') else "",
-        xilinx_root=config.xilinx_path if hasattr(config, 'xilinx_path') else "",
+        xilinx_root=getattr(config, "xilinx_path", ""),
     )
     if not xsct:
         return RebootResult(