[iterate-4A] Milestone-2: XMA audio decoder + RE tooling (dispatch recorder, analyzer vtable-fix, non-perturbing probes)

Milestone-2 (intro video dat/movie/ADV.wmv) audio path + major RE tooling.

XMA AUDIO (built, working, deterministic, tested):
- APU MMIO 0x7FEA0000 + 320x64B register-mapped context array; real XMACreateContext/Release
  (xma.rs); real FFmpeg xma2 decoder XMA_CONTEXT_DATA->S16BE PCM (xma_decode.rs, xma2_codec.rs,
  ffmpeg-sys-next). Decode runs synchronously on the CPU thread (deterministic, no host thread).
- Audio-worker scheduler fix (main.rs LR_HALT restore + scheduler.rs): the XAudio render-callback
  worker was wrongly exited after ~2 deliveries; now survives -> guest drives XMA decode (70 kicks).
- XAudioSubmitRenderDriverFrame made faithful. Golden sylpheed_n50m re-baselined; tests pass.

RE TOOLING:
- Runtime indirect-dispatch recorder (dispatch_rec.rs): records (call-site->target, r3, lr);
  env-gated XENIA_DISPATCH_REC, filters XENIA_DISPATCH_REC_TARGETS/_SITES; deterministic, observe-only.
- Repaired static analyzer (vtables.rs): vtable extraction silently fragmented vtables with
  non-function head slots (missed the XMV engine vtable). Fixed via vptr-write-anchoring -> engine
  fully typed (vtables 722->1150 on rebuild).
- Fixed probe HEISENBUG (main.rs run_superblock): --audit-pc-probe-hex/--mem-watch no longer disable
  superblock chaining; probes fire inside the chain loop -> scheduling identical armed-vs-unarmed,
  movie subsystem now observable. Fixed a --quiet bug swallowing armed trace reports.

VIDEO still doesn't play (B, guest-side): the XMV engine never issues begin-playback (sub_825076F0,
vtable 0x8200a1e8 slot21) -> never primes -> 2000ms timeout. Narrowed to the ARM2 engine-setup
wrappers; no honest our-side gate-fix (masking forbidden). See HANDOFF-iterate-4A-milestone2.md for
new-machine setup (incl. the FFmpeg apt deps + sylpheed.db regeneration) and continuation pointers.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Cargo.lock

@@ -418,6 +418,26 @@ version = "0.22.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "72b3254f16251a8381aa12e40e3c4d2f0199f8c6508fbecb9d91f575e0fbb8c6"
 
+[[package]]
+name = "bindgen"
+version = "0.64.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c4243e6031260db77ede97ad86c27e501d646a27ab57b59a574f725d98ab1fb4"
+dependencies = [
+ "bitflags 1.3.2",
+ "cexpr",
+ "clang-sys",
+ "lazy_static",
+ "lazycell",
+ "peeking_take_while",
+ "proc-macro2",
+ "quote",
+ "regex",
+ "rustc-hash 1.1.0",
+ "shlex",
+ "syn 1.0.109",
+]
+
 [[package]]
 name = "bit-set"
 version = "0.6.0"
@@ -600,6 +620,15 @@ dependencies = [
  "shlex",
 ]
 
+[[package]]
+name = "cexpr"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6fac387a98bb7c37292057cffc56d62ecb629900026402633ae9160df93a8766"
+dependencies = [
+ "nom",
+]
+
 [[package]]
 name = "cfg-if"
 version = "1.0.4"
@@ -639,6 +668,17 @@ dependencies = [
  "inout",
 ]
 
+[[package]]
+name = "clang-sys"
+version = "1.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b023947811758c97c59bf9d1c188fd619ad4718dcaa767947df1cadb14f39f4"
+dependencies = [
+ "glob",
+ "libc",
+ "libloading",
+]
+
 [[package]]
 name = "clap"
 version = "4.6.0"
@@ -1076,6 +1116,20 @@ version = "2.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9f1f227452a390804cdb637b74a86990f2a7d7ba4b7d5693aac9b4dd6defd8d6"
 
+[[package]]
+name = "ffmpeg-sys-next"
+version = "6.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c2529ad916d08c3562c754c21bc9b17a26c7882c0f5706cc2cd69472175f1620"
+dependencies = [
+ "bindgen",
+ "cc",
+ "libc",
+ "num_cpus",
+ "pkg-config",
+ "vcpkg",
+]
+
 [[package]]
 name = "filetime"
 version = "0.2.27"
@@ -1317,6 +1371,12 @@ dependencies = [
  "xml-rs",
 ]
 
+[[package]]
+name = "glob"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0cc23270f6e1808e30a928bdc84dea0b9b4136a8bc82338574f23baf47bbd280"
+
 [[package]]
 name = "glow"
 version = "0.13.1"
@@ -1898,6 +1958,12 @@ version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bbd2bcb4c963f2ddae06a2efc7e9f3591312473c50c6685e1f298068316e66fe"
 
+[[package]]
+name = "lazycell"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "830d08ce1d1d941e6b30645f1a0eb5643013d835ce3779a5fc208261dbe10f55"
+
 [[package]]
 name = "lexical-core"
 version = "1.0.6"
@@ -2139,6 +2205,12 @@ dependencies = [
  "sketches-ddsketch",
 ]
 
+[[package]]
+name = "minimal-lexical"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "68354c5c6bd36d73ff3feceb05efa59b6acb7626617f4962be322a825e61f79a"
+
 [[package]]
 name = "miniz_oxide"
 version = "0.8.9"
@@ -2262,6 +2334,16 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "nom"
+version = "7.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d273983c5a657a70a3e8f2a01329822f3b8c8172b73826411a55751e404a0a4a"
+dependencies = [
+ "memchr",
+ "minimal-lexical",
+]
+
 [[package]]
 name = "nu-ansi-term"
 version = "0.50.3"
@@ -2325,6 +2407,16 @@ dependencies = [
  "libm",
 ]
 
+[[package]]
+name = "num_cpus"
+version = "1.17.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "91df4bbde75afed763b708b7eee1e8e7651e02d97f6d5dd763e89367e957b23b"
+dependencies = [
+ "hermit-abi",
+ "libc",
+]
+
 [[package]]
 name = "num_enum"
 version = "0.7.6"
@@ -2657,6 +2749,12 @@ version = "1.0.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "57c0d7b74b563b49d38dae00a0c37d4d6de9b432382b2892f0574ddcae73fd0a"
 
+[[package]]
+name = "peeking_take_while"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "19b17cddbe7ec3f8bc800887bab5e717348c95ea2ca0b1bf0837fb964dc67099"
+
 [[package]]
 name = "percent-encoding"
 version = "2.3.2"
@@ -4961,8 +5059,10 @@ dependencies = [
 name = "xenia-apu"
 version = "0.1.0"
 dependencies = [
+ "ffmpeg-sys-next",
  "thiserror 2.0.18",
  "tracing",
+ "xenia-memory",
  "xenia-types",
 ]
 
@@ -5025,6 +5125,7 @@ dependencies = [
  "metrics",
  "thiserror 2.0.18",
  "tracing",
+ "xenia-apu",
  "xenia-cpu",
  "xenia-gpu",
  "xenia-hid",