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docs(kb): what adversarial review found, and four vacuity shapes
From PRs #143/#146/#147/#150/#152/#156/#157 and the adversarial review of the
first five.

The finding worth the review's cost: `Repr::Nonfinite(&'a str)` could only be
produced by a deserializer that borrows from its input, so the new wire
spelling round-tripped through `from_str` and `from_slice` and nothing else —
the same JSON document escaped as `inf` was refused, and `to_value` did
not round-trip its own output. Both of the PR's tests used `from_str`, which
is precisely the one path that borrows.

Four vacuity shapes, each confirmed by injection rather than argued:

- A disjunctive assertion can accept the bug it guards — one branch here was
  exactly the error message the defect produces.
- A law asserted over an immutable `CmdContext` is a tautology: a `Cmd` is
  pure over its context by construction, so `execute` twice without applying
  effects asserts `f(x) == f(x)` and no rival can fail it. Applying the
  effects REFUTED this one rather than rescuing it.
- A rival must fail the property, not the setup — `AddFormula` and
  `RemoveItem` are both `CellData`, so the obvious test proved the neighbour.
- Every agent appends to the same evidence file at EOF: four conflicts in ten
  PRs. Loud, but the resolution is the hazard, since `--check-evidence` cannot
  see a dropped entry.

kb_consistent: TRUE, 803 facts.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FC2jVn8Au7E9JPkw6bwXXH
2026-09-22 19:49:23 -07:00
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