Module worktree 

Verifying the WORKING TREE — the check an agent actually wants.

weave check used to compare HEAD against MERGE_HEAD: two commits, not the working-tree resolution someone had just written. That misses the dominant real defect in these merges, which is not a mis-resolved marker — it is silent breakage in the unconflicted region that no marker points at, findable only by reading the whole file by hand. That reading is the cost this module exists to remove.

So the subject is the file on disk, and the questions are the four an agent asks after editing:

1. markers — did I finish? (including weave’s own teach line)
2. loss — did I drop a line BOTH sides kept? Unanimity is the one thing a resolution may never overrule: neither developer asked for it to go.
3. duplicates — did the merge state something more times than either side did? Same ruler as weave_core::frame, applied to the whole file instead of the frame.
4. dangling — is anything still called that nothing defines any more? Binding evidence, repo-wide, the same functions the per-file pass uses.

Every verdict is stated as a sentence, never as an empty array. A reader who gets back a bare [] reasonably takes it for approval; a channel whose “nothing found” and “nothing looked at” render identically has a failure mode where silence is indistinguishable from a clean bill of health.

Why the bounds below are the ones they are

A verifier that replaces a manual pass is only worth its calls if its findings are evidence. Every rule here is therefore stated as a necessary condition on a correct resolution — one the developer’s own committed resolution satisfies — and the three ways that can be got wrong are all ways this file once got them wrong:

• The unanimity floor is base-relative and additive. min(ours, theirs) is what a merge must keep only if the two sides always delete the same copies of a repeated line, which on real code they never do. The bound is min(n, ours) + min(n, theirs) − n over base’s n copies, floored at zero — the predicate [weave_core::container] enforces inside the merge. Two owners of one rule is one owner too many, so this states it the same way rather than a second way.
• The duplication ceiling is additive too. Two sides that each add a copy of the same line license a resolution that has one more copy than either side does; max(base, ours, theirs) calls every such union a duplicate. The ceiling is the one weave_core::frame::frame_duplicates already uses.
• Multiplicity is only evidence for a line that has an identity. frame says this for structural punctuation. It is equally true of a continuation fragment — anyInt(),, await fire_event( — which is not a statement but a slice of one, and repeats wherever the same call shape is written. A fragment counts only when it is part of a run of over-budget lines, which is what a doubled edit actually looks like.

and one that is about names rather than lines:

• A declaration and its impl blocks are ONE nameable thing. Rust’s struct X plus impl X is not X defined twice; neither is a namespace reopened, an interface merged, two test('…') calls sharing a title, or two overloads sharing a name. Identity is (kind, name, signature) with the kinds that attach to a declaration excluded — not the bare name.

Structs

Finding

One finding about one file, already in the words the reader gets.

Report

Everything one run of the working-tree check looked at and concluded.

Verdict

One file’s verdict. An empty findings is the OK verdict and prints as a sentence.

Functions

check

Verify a whole working tree against the three merge stages.