Keep weekend-rush fixtures internally matched

[rogerchappel]

Summary

• generate the supporting vendor and invoice when weekend-rush runs against empty/custom fixtures
• compare exact expected and detected finding types and assert a perfect score
• document the generated supporting-row contract

Commits

• 08c4ce7 test: cover empty weekend rush fixtures
• d1dfa87 fix: support weekend rush payments
• ee60ca1 docs: explain weekend rush support rows

Verification

• npm install
• npm run release:check (34 tests; CLI, docs install, and package smoke passed)
• git diff --check origin/main...HEAD

The exact registry slug rogerchappel/ledgerpet was verified, the canonical checkout was clean, origin/main remained at c2a74cf9555da17ef0f9c62bdbc04631605ed239, and open PRs #7 and #10 are unrelated Actions dependency updates.

[rogerchappel]

Automated merge note

Triage class: auto-merge

Summary: Adds supporting synthetic vendor/invoice rows so empty-fixture weekend-rush generation yields only its expected matched anomaly; includes regression coverage and README contract clarification.

Checks run: GitHub CI Repository hygiene — SUCCESS; local npm run release:check (34 tests, CLI/docs/package dry-run) and git diff --check reported by PR author.

Rebased/CI-repaired: No.

Verified head SHA: ee60ca10d60540e187ab49a2dbbba26f4dfca266.