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docs/pre15-stage0/P15-045.md

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+# P15-045 Stage0 Decision
+
+Status: `STOP`. B35 is `STOP-NO-SOURCE`.
+
+G07 is replayed against frozen BASE
+`13974efc00c31d8c13c8dccb7c65a82adafcbff6`. Its first mandatory condition
+is a concrete, versioned support/deployment manifest in existing project
+evidence that identifies deployment targets and explicitly requires Zstd to
+be enabled by default. General codec availability, prior Zstd test success,
+Linux defaults, and maintainer preference are intentionally nonqualifying.
+
+The gate inventories every tracked path in the frozen
+`planning/pre15/evidence` tree (tree object
+`3ecce7a124d153638853ab5d897126c769125309`, 2,560 paths), locates every text
+record containing Zstd/Zstandard, and reviews records with deployment,
+support, manifest, policy, default, or requirement signals. It accepts either
+a structured JSON manifest or explicit text manifest headers, but requires a
+manifest kind, version, nonempty deployment/support targets, and an
+affirmative Zstd-default requirement together. The replay finds 596 Zstd text
+records and 206 demand-signal candidates; no record meets that contract.
+
+The missing deployment-demand prerequisite determines STOP before runtime or
+build work. The disabled exact-`EOPNOTSUPP` runtime check, enabled real Zstd
+EROFS read, FreeBSD kernel `ZSTDIO` symbol/capability check, and KLD size delta
+measurement are therefore `NOT_RUN`; none is reported as PASS. In particular,
+the gate does not claim or attempt to load a generic dependency KLD. A
+false-GO guard requires every G07 condition to be PASS.
+
+The frozen source is checked only to preserve the current policy boundary:
+`src/Makefile` contains exactly one `WITH_ZSTDIO?= 0` default, the disabled
+stub returns `EOPNOTSUPP`, and the documentation names kernel
+`options ZSTDIO`. These are static observations, not substitutes for the
+runtime conditions omitted after the prerequisite STOP.
+
+The committed replay evidence is recorded under
+`planning/pre15/evidence/20260816T033449Z-G07-P15-045/`. The gate owns one
+temporary directory, uses a 90-second internal absolute timeout plus the
+recorded outer timeout, records argv, source/candidate hashes, exit status,
+and cleanup, and rejects an existing output directory.
+
+No production source, B35 case, B35 fixture, QEMU process, full feature suite,
+or smoke suite is run or changed. Protected PID 26318, port 9222, and the
+shared base image are outside the gate. The supported policy remains opt-in
+`WITH_ZSTDIO=1`, with default `WITH_ZSTDIO?=0`.