feat(cli): skip unchanged files using device file_hashes.json

Read and update file_hashes.json on deploy; add --force-upload and tests.

Co-authored-by: Cursor <cursoragent@cursor.com>

deploy_manifest.py

@@ -0,0 +1,45 @@
+"""
+Host-side helpers for file_hashes.json (same format as led-driver/src/file_hashes.py).
+"""
+
+import hashlib
+import json
+import os
+
+MANIFEST_VERSION = 1
+MANIFEST_FILENAME = "file_hashes.json"
+HASH_ALGO = "sha256"
+
+
+def normalize_remote_path(remote_file: str) -> str:
+    """Device-relative path with forward slashes (no leading slash)."""
+    return remote_file.replace("\\", "/").lstrip("/")
+
+
+def sha256_hex_file(path: str) -> str:
+    h = hashlib.sha256()
+    with open(path, "rb") as f:
+        for chunk in iter(lambda: f.read(65536), b""):
+            h.update(chunk)
+    return h.hexdigest()
+
+
+def parse_manifest(data: bytes) -> dict:
+    """Return path -> hash map from manifest bytes."""
+    try:
+        doc = json.loads(data.decode("utf-8"))
+    except (UnicodeDecodeError, json.JSONDecodeError, TypeError, ValueError):
+        return {}
+    if not isinstance(doc, dict):
+        return {}
+    files = doc.get("files")
+    return dict(files) if isinstance(files, dict) else {}
+
+
+def build_manifest_bytes(files: dict) -> bytes:
+    doc = {
+        "version": MANIFEST_VERSION,
+        "algorithm": HASH_ALGO,
+        "files": files,
+    }
+    return json.dumps(doc, separators=(",", ":")).encode("utf-8")