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+# P15-006 Stage0 Decision
+
+Status: `GO`; B07a is complete.
+
+The authoritative baseline replay used commit
+`6673f51152a5195a8a8903aa801f820abce7936e`.  This decision is independent of
+the earlier P15-005 GO: P15-006 has its own corpus, model digest, source
+extractors, byte encoding, and decision record.
+
+The frozen corpus contains 80 map tuples and 13 device-resolution cases.  The
+map tuples comprise 50 plain/inline/chunk producer cases and 30 compressed
+explicit-extent cases.  They cover plain and inline boundaries, holes, raw
+32-bit chunks, indexed 32-bit chunks, indexed 48-bit chunks, masked and
+nonzero device IDs, all four explicit extent record sizes, fragments, partial
+references, exact and post EOF, provider/metabox bounds, checked arithmetic
+overflow, invalid formats and algorithms, and errors both before and after
+metadata acquisition.  The device cases separately exercise primary,
+multidevice, flat-device, unified-address, missing-provider, range, and
+overflow behavior without changing GEOM ownership.
+
+Expected records are produced by an independent arithmetic and on-disk record
+decoder whose frozen SHA256 is
+`effcf0b6cc6a6e916eae89a14ad52d7b96273a453556647b6eabf2926fcb4abb`.
+The gate separately extracts the real `data.c` and `zmap.c` producer bodies
+from the frozen BASE, compiles them with `-Werror`, and compares every
+`m_la`, `m_pa`, `m_llen`, `m_plen`, `m_deviceid`, `m_flags`,
+`m_algorithmformat`, positive errno, acquire count, and release count.  It
+also packs those fields with fixed layout `<QQQQH2xIiiII`; the baseline tuple
+bytes have SHA256
+`8d3fec7ccbdfb7f7c851a494b6ecad02b8a019247bd9486188f8d37c169faedd`.
+Two complete baseline replays produced byte-identical tuple, device, and
+result files.
+
+Protected hashes freeze the existing plain/chunk and compressed producers,
+metadata acquire/put paths, physical I/O path, and device/GEOM mapping bodies.
+The candidate replay additionally requires FULL and COMPACT dispatch to pass
+all five map flag bits and all tuple fields through the new adapter.  Every
+observed acquisition is balanced: the baseline contains 41 paths at 0:0, 30
+at 1:1, seven at 2:2, and two at 3:3.  All successful non-EOF mappings have a
+positive `m_llen`; Pre13 H07 remains closed.
+
+This closes the specific Pre13 H01 oracle gaps for chunk, multidevice, bounds,
+and overflow rather than reusing the old 26 plain/inline/hole tuples.  The
+supplied G02 prep remains a non-authoritative prototype and was not used as
+the tuple source.
+
+The B07a implementation is commit
+`141b11f0d847a63a47b6c6143e4c2913a1147a0f`.  Its authoritative host run
+replayed all 80 tuples and 13 device cases against the frozen oracle.  The
+4,480-byte tuple streams are byte-identical with SHA256
+`8d3fec7ccbdfb7f7c851a494b6ecad02b8a019247bd9486188f8d37c169faedd`;
+FULL and COMPACT dispatch preserve every tuple field and all five map flag
+bits.  D and both K2 configurations pass, with no global or undefined symbol
+delta from B06.
+
+QEMU and the full feature suite were not run.  The final plan requires host
+tuple replay, D, and K2 for B07a; it does not require a B07a QEMU fixture.
+B07b is now dependency-unblocked for a separate batch.  B07c remains blocked
+on B07b, and B08 remains blocked on B07c.  This decision neither implements
+nor pre-accepts any of those later batches.