chore: add migration/ bundle for cross-machine setup

Bundles state that lives OUTSIDE the xenia-rs repo so a fresh clone on
another machine can be brought up to identical configuration via
migration/setup.sh:

  - claude-memory/             ~/.claude/projects/-home-fabi-RE-Project-Sylpheed/memory/
                               (103 files, 1.1 MB - MEMORY.md + every
                                project_xenia_rs_*.md from audits
                                addis_signext through audit-058)
  - project-root/dot-claude/   <project-root>/.claude/settings.json
                               (Stop hook + permissions)
  - project-root/ppc-manual/   <project-root>/ppc-manual/
                               (PowerPC reference docs, 397 files, 3.7 MB)
  - project-root/run-canary.sh <project-root>/run-canary.sh
  - README.md                  Human-readable setup checklist
  - setup.sh                   Idempotent installer (also reclones
                               xenia-canary at pinned HEAD 6de80dffe)
  - MANIFEST.md                Per-file mapping + per-file-not-bundled
                               restoration recipe

Excluded from bundle (not shippable via git):
  - Sylpheed ISO (7.8 GB; copyright; manual copy required)
  - sylpheed.db (395 MB; regenerable from XEX via analysis tooling)
  - target/ build artifacts (rebuild on target)
  - audit-runs probe firehoses (.log/.stdout/.stderr ~11 GB; rerun if needed)
  - audit-runs memory dumps (.bin ~4.5 GB; rerun audit-026/027/029 if needed)
  - xenia-canary checkout (setup.sh reclones from
    git.mc02.dev/fabi/Xenia-Canary.git at HEAD 6de80dffe)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

migration/project-root/ppc-manual/vmx/vupkhsh.md

@@ -0,0 +1,125 @@
+# `vupkhsh` — Vector Unpack High Signed Half Word
+
+> **Category:** [VMX (Altivec)](../categories/vmx.md) · **Form:** [VX](../forms/VX.md) · **Opcode:** `0x1000024e`
+
+<!-- GENERATED: BEGIN -->
+
+## Assembler Mnemonics
+
+| Mnemonic | XML entry | Flags | Description |
+| --- | --- | --- | --- |
+| `vupkhsh` | `vupkhsh` | — | Vector Unpack High Signed Half Word |
+
+## Syntax
+
+```asm
+vupkhsh [VD], [VB]
+```
+
+## Encoding
+
+### `vupkhsh` — form `VX`
+
+- **Opcode word:** `0x1000024e`
+- **Primary opcode (bits 0–5):** `4`
+- **Extended opcode:** `590`
+- **Synchronising:** no
+
+| Bits | Field | Meaning |
+| --- | --- | --- |
+| 0–5 | `OPCD` | primary opcode (4) |
+| 6–10 | `VRT/VD` | destination vector register |
+| 11–15 | `VRA/VA` | source A vector register |
+| 16–20 | `VRB/VB` | source B vector register |
+| 21–31 | `XO` | extended opcode (11 bits) |
+
+## Operands
+
+| Field | Role | Description |
+| --- | --- | --- |
+| `VB` | vupkhsh: read | Source B vector register. |
+| `VD` | vupkhsh: write | Destination vector register. |
+
+## Register Effects
+
+### `vupkhsh`
+
+- **Reads (always):** `VB`
+- **Reads (conditional):** _none_
+- **Writes (always):** `VD`
+- **Writes (conditional):** _none_
+
+## Status-Register Effects
+
+_No condition-register or status-register effects._
+
+## Operation (pseudocode)
+
+```
+; Pseudocode derives directly from the xenia-rs interpreter
+; arm (see Implementation References). Operation semantics:
+;   - Read source operands from the fields listed under Operands.
+;   - Apply the arithmetic / logical / memory action described
+;     in the Description field above.
+;   - Write results to the destination register(s); update any
+;     status bits enumerated under Status-Register Effects.
+; Consult the IBM AIX reference link under IBM Reference for
+; canonical PPC-style pseudocode where xenia's expression is
+; terse.
+```
+
+## C Translation Example
+
+```c
+/* C translation: the xenia-rs interpreter arm below in           */
+/* Implementation References is the authoritative semantic        */
+/* snapshot. Translate it line-by-line:                            */
+/*   - ctx.gpr[N]  -> r[N]       (or f[]/v[] for FPRs/VRs)        */
+/*   - mem.read_u*/write_u* -> mem_read_u*_be / mem_write_u*_be   */
+/*   - ctx.update_cr_signed(fld, v) -> update_cr_signed(fld, v)   */
+/*   - ctx.xer_ca / xer_ov / xer_so -> xer.CA / xer.OV / xer.SO   */
+/* The Register Effects and Status-Register Effects tables above  */
+/* enumerate every side effect a faithful translation must emit.  */
+```
+
+## Implementation References
+
+**`vupkhsh`**
+- xenia-canary XML: [`tools/ppc-instructions.xml` — search for `mnem="vupkhsh"`](../../xenia-canary/tools/ppc-instructions.xml)
+- xenia-canary emit: [`src/xenia/cpu/ppc/ppc_emit_altivec.cc:2021`](../../xenia-canary/src/xenia/cpu/ppc/ppc_emit_altivec.cc#L2021)
+- xenia-rs opcode: [`crates/xenia-cpu/src/opcode.rs:128`](../../xenia-rs/crates/xenia-cpu/src/opcode.rs#L128)
+- xenia-rs decoder: [`crates/xenia-cpu/src/decoder.rs:488`](../../xenia-rs/crates/xenia-cpu/src/decoder.rs#L488)
+- xenia-rs interpreter: [`crates/xenia-cpu/src/interpreter.rs:4154-4160`](../../xenia-rs/crates/xenia-cpu/src/interpreter.rs#L4154-L4160)
+<details><summary>xenia-rs interpreter body (frozen snapshot)</summary>
+
+```rust
+        PpcOpcode::vupkhsh => {
+            let b = crate::vmx::as_i16x8(ctx.vr[instr.rb()]);
+            let mut r = [0i32; 4];
+            for i in 0..4 { r[i] = b[i] as i32; }
+            ctx.vr[instr.rd()] = crate::vmx::from_i32x4(r);
+            ctx.pc += 4;
+        }
+```
+</details>
+
+<!-- GENERATED: END -->
+
+## Special Cases & Edge Conditions
+
+- **Sign-extend the high 4 of 8 half-words into words.** `VB.h[0..3]` are each reinterpreted as `int16` and sign-extended to `int32` in `VD.w[0..3]`.
+- **Inverse of the high half of [`vpkswss`](vpkswss.md)** (within the `int16` range).
+- **Big-endian lane ordering.**
+- **No saturation, no flags, no VSCR effect.**
+- **VMX128 sibling [`vupkhsh128`](vupkhsh128.md).**
+
+## Related Instructions
+
+- [`vupklsh`](vupklsh.md) — unpacks the low 4 half-words.
+- [`vupkhsb`](vupkhsb.md), [`vupklsb`](vupklsb.md) — byte → half-word sign-extending unpacks.
+- [`vpkswss`](vpkswss.md), [`vpkswus`](vpkswus.md) — the inverse pack (saturating).
+
+## IBM Reference
+
+- [AIX 7.3 — `vupkhsh` (Vector Unpack High Signed Half Word)](https://www.ibm.com/docs/en/aix/7.3.0?topic=set-vupkhsh-vector-unpack-high-signed-half-word-instruction)
+- [IBM AltiVec Technology Programmer's Interface Manual, Chapter 6 — Permute and Formatting](https://www.nxp.com/docs/en/reference-manual/ALTIVECPIM.pdf)