fuzz-target-every-parse: the §3.2 differential target — three parsers + skip_forward through the doc-hidden surfaces via shared invariants, 66 committed seeds + gitignore negation + README row; two real skip_forward findings fixed inline (division-by-zero/negative-interval wrap on sqlite+mem, i64 gap subtraction overflow on all three engines incl. pg) and registered as PROVENANCE D-38

fuzz/README.md

@@ -28,7 +28,7 @@ libFuzzer targets for alkstore's parse/codec surfaces (see
 | Target | Drives | Invariants |
 |---|---|---|
 | `payload_codec` | `encode_payload` / `payload_as::<T>` (`alkstore/src/payload.rs`) | no-panic on any byte sequence; every decode failure typed `Error::Codec`; deep nesting loud at serde_json's recursion limit; `Value` round-trip (serde_json canonicalization pinned); typed round-trip for a representative payload set |
-| `every_parse` | the three `parse_every_interval` implementations (differential) | filled by its target task |
+| `every_parse` | the three `parse_every_interval` implementations (differential, through the engines' `#[doc(hidden)]` re-exports) + each engine's `skip_forward` boundary arithmetic | no-panic on any UTF-8-lossy string (each parser, each boundary path); typed rejection (`Error::InvalidSpec` on pg/mem, the substrate's error under its mapping on SQLite); three-way agreement on the Ok/Err partition and the `Ok` interval value (error identity not pinned — the SQLite `Result<i64, String>` vs `InvalidSpec` asymmetry is known); overflow posture: `skip_forward` over adversarial `(next_fire_at, now, interval)` triples rejects-or-saturates, never wraps or panics; the `n <= 0` and giant-`n` arms (leading zeros, digit overflow at exactly `i64::MAX/86400`, positive-zero rejection) |
 | `name_validation` | `validate_name` / `validate_shared_name` / `validate_local_name` (`alkstore/src/validation.rs`) | filled by its target task |
 
 ## Commands