decoder: mount the disassembly DB and the flat VA image

The decoder had neither, and reported the gap precisely: four scripts in this
repo READ /work/xenia-rs/sylpheed.db and nothing produces it, so the whole static
PPC route was consumers with the producer missing.

Both exist on the host and are now mounted read-only: the 586 MB database (25 481
functions, 851 classes with RTTI, EH tables, imports, 1.8M indirect-dispatch
candidates) and the decompressed image.

The image is the more useful of the two. It is a FLAT VA DUMP -- file offset =
VA - 0x82000000 -- so reading a known address needs no XEX decrypt, no LZX, and
no booted emulator. The decoder had independently recovered the same bytes by
dumping /dev/shm/xenia_memory_* and validating against the GamePart table, which
is good work and a sound method, but it noted itself that needing a running
emulator is a bad dependency for something the entire static corpus rests on. It
does not need one.

Also recorded that an earlier claim the .pe was STALE was tested and refuted, so
nobody re-litigates it, and that instructions.raw is an INT rather than hex.

Written down as reference material, explicitly NOT a deliverable: they are
read-only, they come from outside the repository, and a fresh checkout elsewhere
has neither. Reimplementing the producer belongs in sylpheed-formats, and until
it exists every static finding rests on an artefact this project cannot rebuild.

docker/decoder/sylph-decoder

@@ -110,6 +110,21 @@ docker_args() {
     # is the most expensive kind of missing mount.
     -v "${SYLPH_DISC:-$PROJECT/sylph_extract}:/disc:ro"
     -e "SYLPHEED_DISC=/disc"
+    # ── the static-analysis corpus ──
+    # The xenia-rs era's disassembly database and the flat VA image. Neither is
+    # reproducible from anything in this repository yet -- the four scripts that
+    # READ sylpheed.db have no producer here -- so they are mounted read-only
+    # from the host as reference material.
+    #
+    # The `.pe` matters most: it is the decompressed image as a flat VA dump
+    # (file offset = VA - 0x82000000), which removes the need to boot the
+    # emulator and scrape /dev/shm to get at it. An earlier belief that this
+    # file was STALE was tested and refuted -- it is current.
+    -v "${SYLPH_XENIA_RS:-$PROJECT/xenia-rs}:/xenia-rs:ro"
+    -v "${SYLPH_PE:-$PROJECT/Project Sylpheed - Arc of Deception (USA, Europe) (En,Ja).pe}:/image/sylpheed.pe:ro"
+    -e "SYLPHEED_DB=/xenia-rs/sylpheed.db"
+    -e "SYLPHEED_PE=/image/sylpheed.pe"
+    -e "SYLPHEED_IMAGE_BASE=0x82000000"
     # The shared exchange: transient files with provenance, outside git history.
     -v "sylpheed-exchange:/exchange"
     -e "PROJECT_DIR=/work"