• Update wheels to libgit2 1.9.7

• New exception hierarchy: AlreadyExistsError, InvalidSpecError,
  InvalidError, NotFoundError, AmbiguousError, AuthError, and
  CertificateError all inherit from GitError and the appropriate Python
  built-in exception (ValueError/KeyError) for backward compatibility
  #830

• Fix DiffDelta.is_binary and DiffDelta.flags returning stale values for
  deltas obtained from Diff.deltas; flags are now loaded lazily
  #962
  #1100

• Fix repo.submodules.get() and name in repo.submodules raising
  AlreadyExistsError when a repository exists at the submodule path but was
  never registered as a submodule; they now return None and False
  respectively as documented
  #1487

• Fix BlobIO cleanup deadlock on partial reads
  #1488
  #1491

• Fix leaks and crashes in error paths
  #1478
  #1479
  #1480
  #1481

• Fix custom ODB and refdb backend callbacks overwriting a pending Python
  exception (e.g. RuntimeError) with a stale libgit2 error message.

• Documentation fixes
  #1490

• CI (macOS): build architecture-specific OpenSSL/libssh2/libgit2
  dependencies instead of universal binaries, producing smaller wheels.

• New RemoteCallbacks.custom_headers()
  #1465

• New rebase API: Repository.rebase_init(...), Repository.rebase_open(...),
  Rebase, and RebaseOperation
  #1483

• Fix Config.snapshot() for non-repository configs, allow PathLike in
  Config.__init__(), and improve config documentation
  #1468

• Fix UnicodeDecodeError with non-UTF-8 file paths in Repository.status(),
  DiffFile.path, index paths, checkout callbacks, and related APIs
  #1451
  #1469

• Fix enums.CheckoutStrategy.CONFLICT_STYLE_ZDIFF3, which was mistakenly
  bound to the DIFF3 constant
  #1483

• Fix crashes and reference-lifetime bugs in custom refdb backends
  #1471
  #1474
  #1475
  #1476

• Update wheels to libgit2 1.9.6 and OpenSSL 3.5.7

• Add riscv64 wheels
  #1463

Breaking changes:

• Remove deprecated pygit2.legacyenums module and GIT_* constants,
  use pygit2.enums instead

• Remove deprecated support for passing str to Repository.merge(...),
  pass a Commit, Oid, or Reference object instead

• Repository.merge_file_from_index(...) now returns MergeFileResult by
  default; pass use_deprecated=True for the previous string return, now
  deprecated.

• Remove deprecated Remote.ls_remotes(...), use Remote.list_heads(...)
  instead

• Remove pygit2.to_bytes(...) and pygit2.to_str(...); they were undocumented
  accidental public APIs

• Memory fixes
  #1368
  #1417
  #1443

• Fix Repository.ident
  #1461

• Build/CI fixes and updates
  #1454
  #1459

• Documentation and annotation fixes
  #410
  #1289
  #1323
  #1333
  #1458
  #1460

• Add AGENTS.md file generated by Kimi-k2.6

• Fix refcount and error handling issues in filter_register(...)

• Fix config with valueless keys
  #1457

• New Repository.load_filter_list(...) and FilterList
  #1444

• New Odb.read_header(...) and now Odb.read(...) returns enums.ObjectType instead of int
  #1450

• Build and CI fixes
  #1446
  #1448
  #1455