v0.3.0

Added

• state diff now filters rate/counter/timestamp noise by default so a no-op diff returns zero changes and a real mutation surfaces cleanly.
• state diff --raw to disable the default filter and see every field.
• state diff --only <prefix> to scope the diff to a subtree (e.g. wifi).
• state diff --ignore <path> (repeatable) to add additional dotted paths to skip.

Changed

• state diff output now includes ignored_leaves, ignored_prefixes, only_prefix, and raw for self-describing results.

Fixed

• _path_matches now handles list bracket notation (devices[0]) so --only devices and --ignore devices correctly cover list elements.
• List-length changes no longer collapse to a single summary record; per-element added/removed diffs always surface.
• dict-add / dict-remove events for noise leaves (e.g. signal_dbm appearing on a new device) are no longer silently dropped — they surface as structural changes.

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Verified: 54 unit tests passing, live state diff on Archer BE3500 returns 0 changes for no-op snapshots (was 17 false positives before this release).