feat(git): include untracked files in unstaged snapshots

[nia-sg-bot]

Summary

• include non-ignored untracked working-tree files in unstaged Git snapshots without mutating the index
• retain exact object identities, modes, symlink semantics, ignore rules, and caller-relative pathspec scope
• emit untracked Python files as deterministic added structural snapshots with immutable provenance

Validation

• python3 -m pytest tests/test_git_snapshot.py tests/test_structural.py
• python3 -m pytest
• git diff --check

Part of #21

Remaining work for #21 includes broader resolver fixtures/edge cases beyond this untracked-file slice.

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