Merge bfloat16-senbei workspace restructure, bump to 1.1.0

Adopts the fork's workspace split (senbei-cli / senbei-crypto / senbei-io /
senbei-metadata / senbei-pe), its structured error taxonomy, entry-transform
and layout validation, PE32 dd8 key-formula selection with a skip floor, the
CRT entry-stub dd8 oracle, and the extensionless-file scan skip.

Kept from senbei on top of the restructure:
- ManagedExe detection/routing and the CLR (COR20 + BSJB) metadata restore
  in the EXE pipeline.
- The RET+int3 padding fingerprint as the primary dd8 padding signal, ahead
  of the mutated-position 0xCC fallback.
- docs/, .github/, samples/, tests/ (moved to senbei-cli/tests), and the
  web/ wasm frontend (rewired to the split crates), all of which the fork
  had dropped.
- The fork's README compatibility matrix is not taken: it names real games,
  which the public-repo hygiene rules forbid.
- The wasm32 localtime fallback in logfile and unpack_bytes_force_exe (the
  web app's trap-recovery entry point), both lost in the restructure.

Golden corpus: 35/35 byte-identical. clippy -D warnings clean; wasm32 check
clean for the full workspace.

senbei-cli/tests/logfile.rs

@@ -0,0 +1,47 @@
+use senbei_io::logfile::{Log, local_stamp_compact, local_stamp_display};
+
+#[test]
+fn local_stamp_compact_matches_shape() {
+    let s = local_stamp_compact();
+    // YYYYMMDD-HHMMSS → 15 chars, digit groups around dash
+    assert_eq!(s.len(), 15, "got {s}");
+    assert_eq!(&s[8..9], "-");
+    assert!(s.as_bytes().iter().enumerate().all(|(i, b)| {
+        if i == 8 {
+            *b == b'-'
+        } else {
+            b.is_ascii_digit()
+        }
+    }));
+}
+
+#[test]
+fn local_stamp_display_matches_shape() {
+    let s = local_stamp_display();
+    // YYYY-MM-DD HH:MM:SS → 19 chars
+    assert_eq!(s.len(), 19, "got {s}");
+    assert_eq!(&s[4..5], "-");
+    assert_eq!(&s[7..8], "-");
+    assert_eq!(&s[10..11], " ");
+    assert_eq!(&s[13..14], ":");
+    assert_eq!(&s[16..17], ":");
+}
+
+#[test]
+fn log_writes_timestamped_file_in_target_dir() {
+    let td = tempfile::tempdir().unwrap();
+    let log = Log::create(td.path()).unwrap();
+    log.step("hello");
+    let path = log.path().to_path_buf();
+    drop(log);
+    assert!(path.starts_with(td.path()));
+    let name = path.file_name().unwrap().to_string_lossy();
+    assert!(
+        name.starts_with("senbei-") && name.ends_with(".log"),
+        "unexpected log name: {name}"
+    );
+    // senbei-YYYYMMDD-HHMMSS.log
+    let core = name.trim_start_matches("senbei-").trim_end_matches(".log");
+    assert_eq!(core.len(), 15, "stamp in name: {name}");
+    assert!(std::fs::read_to_string(&path).unwrap().contains("hello"));
+}