Module diff 

AST diff (decided.services.diff): compare two parsed products and classify the changes. Pure AST work — no git, no revisions, no raw-text diffing.

• Requirements match by ID: same ID + same text -> unchanged (omitted); same ID, different text -> modified; ID only in the new -> added; ID only in the old -> removed.
• Metrics and risks are ordered set-difference, de-duped, preserving source order.

Structs

Diff

Diff — the classified differences between two products.

RequirementChange

RequirementChange — a requirement whose text changed (same ID). Field order mirrors the Python dataclass (id, old_text, new_text).

Functions

diff

diff(old, new) — the classified Diff between two products.