Fixed binary-file crash, unified intent semantics, and flagged empty changes - #3

PR made by ox-alpha from opencode on behalf of Kriday.
Field-testing the CLI surfaced three rough edges: one binary file anywhere in a snapshot killed the whole run with a cryptic UTF-8 error, the docket called intent "scope" (and the adapters ignored user intent entirely), and an empty change sailed through as a clean ADJUDICATED. Review pushed the fix further: snapshots now store raw bytes, so distinct binaries can never compare equal.

Summary :

• Snapshot contents are raw bytes (HashMap<String, Vec>); text conversion happens only at tree-sitter parse time. Binary files are tracked exactly instead of crashing or collapsing
• Renamed scope to intent across the struct, renderer, and JSON/TOML; old dockets still load via a serde alias. User intent now wins over touched-paths at every call site
• Added a low-severity D000 notice when base and head have no file differences; verdict is evaluated before the notice is appended, so custom policies (block_on = ["low"]) cannot block empty changes
• Collapsed the adjudication tail (touched paths + empty notice + verdict + intent fallback) into one shared finalize_adjudication used by dir-mode, git, and jj
• Regression tests for every fixed behavior, including two binaries differing by one invalid byte

Ready For Review !!