Initial SyncGames tree: agent, Android, deploy, docs.

Session-gated MinIO save sync with AppImage GUI, CLI edit/session flow, and Gitea release helper.

Co-authored-by: Cursor <[email protected]>

agent/syncgames/hashutil.py

@@ -0,0 +1,42 @@
+from __future__ import annotations
+
+import hashlib
+from pathlib import Path
+
+
+def sha256_file(path: Path) -> str:
+    h = hashlib.sha256()
+    with path.open("rb") as f:
+        for chunk in iter(lambda: f.read(1024 * 1024), b""):
+            h.update(chunk)
+    return f"sha256:{h.hexdigest()}"
+
+
+def sha256_bytes(data: bytes) -> str:
+    return f"sha256:{hashlib.sha256(data).hexdigest()}"
+
+
+def tree_hash(file_checksums: dict[str, str]) -> str:
+    """Canonical tree hash per docs/protocol.md."""
+    lines: list[bytes] = []
+    for rel in sorted(file_checksums.keys()):
+        digest = file_checksums[rel]
+        if digest.startswith("sha256:"):
+            hexdigest = digest[len("sha256:") :]
+        else:
+            hexdigest = digest
+        lines.append(f"{rel}\0{hexdigest}\n".encode("utf-8"))
+    return sha256_bytes(b"".join(lines))
+
+
+def checksum_dir(root: Path, files: list[Path] | None = None) -> dict[str, str]:
+    """Hash files under root; keys are relative posix paths."""
+    out: dict[str, str] = {}
+    if files is None:
+        paths = sorted(p for p in root.rglob("*") if p.is_file())
+    else:
+        paths = files
+    for p in paths:
+        rel = p.relative_to(root).as_posix()
+        out[rel] = sha256_file(p)
+    return out