GeezerVison

What I ran

Gates: tests, docs, changelog, license (aho-corasick is MIT/Unlicense) and FIPS all pass. There is no unsafe code, and I found no flaky patterns. The env-var test re-executes itself as a child process rather than mutating the environment, which is a nice touch.

Missing tests (medium):

• Over-redaction. Nothing checks that a secret which is a common word (≥8 bytes) leaves unrelated text alone (see the inline comment).
• Text log path end to end. Nothing covers the non-JSON pipeline log through init_pipeline_logging_with_redaction. Only RedactingMakeWriter is tested, with a fake redactor.
• Concurrency. Nothing covers register racing with redact, or a panic raised inside register while the write lock is held (the panic hook then calls redact and needs the read lock).
• Checkpoint restore. No test covers a connector error list restored from a checkpoint that still holds the raw value.

Observation (low): the "JSON-escaped" form in the description is really the Rust {:?} form. For control characters the two differ: serde_json writes \u0001, while Debug writes \u{1}. A value embedded with serde_json::to_string and containing such a character therefore slips through.

Otherwise this looks solid as a second layer.

What I ran (debug build)

The design looks sound: the panic hook's try_read avoids the deadlock, env refs are excluded, and there are no unsafe blocks. aho-corasick is MIT/Unlicense, which is fine.

Missing (medium): uncovered cases.

• A secret preceded by an escape sequence in Debug-formatted text-log fields (\n, \t) or by percent-encoded text (%3D). This currently leaks (inline comment).
• An overlapping shorter form after a longer match is rejected at a token boundary, e.g. the URL password inside a URI followed by a word character. This currently leaks (inline comment).
• Text (non-JSON) logging through init_pipeline_logging_with_redaction. It is tested only with a fake Replace redactor, never with the real registry and the {value:?} field formatter.
• status_error_shows_the_secret_reference_not_the_value would likely pass without this PR, because [connectors,types,manager] Keep connector credentials out of diagnostics #7786 already omits the URI at the source. To prove the registry is the layer under test, assert that ${secret:kubernetes:pg/uri} appears in the body.

Pitfall (low): a panic while register holds the write lock still reaches the DBSP hook and the logging layer, which take a blocking read(). The expect is the only panic site, so this is unlikely.