With several --dir values, one that did not exist was skipped silently: the
no-files guard only fires when every directory is empty, so
`--dir lib --dir tset` scanned lib and reported as though it had covered what
was asked for. A --dir that does not exist is now an error naming it.
A directory that could not be listed, or a baseline that could not be read or
written, escaped as an uncaught FileSystemException: exit 255 and a stack
trace. Those paths now raise a PipeException with the OS reason (exit 2), and
bin/pipe.dart catches any remaining FileSystemException the same way. The exit
codes are documented in bin/pipe.dart: 0 success, 1 a gate failed, 2 pipe could
not do what was asked, 64 usage.
rule_scope_claim_test widened the fixture with a test/ directory it does not
have, relying on exactly the silent skip; it now builds a project that has one.
The finding said "nothing anywhere ever dispatches or constructs X" while the
analysis only ever scanned --dir (default lib). On a real app that overclaim was
false for 67 of its 77 findings: their events are constructed by TEST code, which
pipe never read. The claim, not the count, was the bug:
$ pipe check . --rule dead-handler # 77 findings
$ pipe check . --dir lib --dir test --rule dead-handler # 10 findings
67 features were one reading away from being "wired up" as missing UI, and the
same overclaim nearly justified deleting a handler covered by five seeded fuzz
tests - pipe said nothing anywhere constructed the event, because it never looked
in test/.
The message now names the scope it actually searched ("nothing under lib ever
dispatches or constructs X"), `Project` records the scanned directories so any
finding can do the same, and the remediation says to check for a dispatch in a
directory that was not scanned before wiring, since test-only handlers are not
missing features.
Found while auditing 77 "dead handlers" for a UI-wiring task: the first deletion
candidate turned out to be referenced by test/blocs/.../artist_dashboard_orders_fuzz_test.dart.
112 tests (was 109), dart analyze clean.
