Round 6 converted three of four `is_demo` 403s to a structured detail and wrote a docstring saying it
had converted all the sites there are. The account-delete route in `routes/me.py` still answered a
hand-written English sentence, which `notifyActionError` discards in favour of the caller's
translated fallback — so the demo user gets no hint that the demo account is the reason. It is
UI-gated today, so the string is unreachable; what was reachable was the false completeness claim,
which is precisely what stops the next reader from looking. The site is converted, and the list is
now DERIVED from the source: a new test walks `app/` for every `is_demo`-guarded 403, asserts each
raises a structured detail, and fails when the count moves — so this file cannot fall behind the code
the way it just did.
The same round's frontend contract guard was failing open. Its pattern required a bare identifier
before `.detail` and excluded `.detail` used as a last call argument, so `setErr(e.detail)`,
`(e as HttpError).detail`, `String(e.detail)` and four more idiomatic forms were invisible — and
because the file set is compared with `toEqual`, a file the pattern cannot see is simply never listed
and the gate stays green over a fresh copy of the contract. Widened to cover cast receivers, optional
chains and call-argument reads; the pinned set is unchanged, so the narrowing had removed no false
positive. A destructured `detail` stays out of reach (a pattern loose enough for it fires on
react-query's own `const { data: detail }`), and that hole is written into the test rather than
papered over with two innocent files.
Its anti-vacuity guard also did not guard anything: the comment says the glob must have matched
something, but the assertion under it read a sibling file by its own URL, which resolves whether or
not the glob enumerated anything. That only mattered while the pinned list was non-empty — the moment
the deferral sweep lands and it becomes [], the whole file would pass over a glob matching zero
files. The scan size is asserted now.
peter
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