chore: update llama-cpp to b7898 and opencode to v1.1.48

- Update llama-cpp from b7867 to b7898
- Update opencode from v1.1.12 to v1.1.48 with improved build process:
  - Replace custom bundle script with official script/build.ts
  - Add shell completion support
  - Add version check testing
  - Simplify node_modules handling
- Update llama-swap service config with new llama.cpp options
- Clarify opencode agent testing workflow in developer and reviewer configs

packages/opencode/remove-special-and-windows-build-targets.patch

@@ -0,0 +1,99 @@
+From 4d0a82e8f3cf8bf011e2592677db4aa31b6b290b Mon Sep 17 00:00:00 2001
+From: Thierry Delafontaine <delafthi@pm.me>
+Date: Sun, 4 Jan 2026 20:55:49 +0100
+Subject: [PATCH]  Remove special and windows build targets
+
+---
+ packages/opencode/script/build.ts | 70 +++++++++++++++----------------
+ 1 file changed, 35 insertions(+), 35 deletions(-)
+
+diff --git a/packages/opencode/script/build.ts b/packages/opencode/script/build.ts
+index f51cb2924..ee3c0e863 100755
+--- a/packages/opencode/script/build.ts
++++ b/packages/opencode/script/build.ts
+@@ -33,27 +33,27 @@ const allTargets: {
+     os: "linux",
+     arch: "x64",
+   },
+-  {
+-    os: "linux",
+-    arch: "x64",
+-    avx2: false,
+-  },
+-  {
+-    os: "linux",
+-    arch: "arm64",
+-    abi: "musl",
+-  },
+-  {
+-    os: "linux",
+-    arch: "x64",
+-    abi: "musl",
+-  },
+-  {
+-    os: "linux",
+-    arch: "x64",
+-    abi: "musl",
+-    avx2: false,
+-  },
++  // {
++  //   os: "linux",
++  //   arch: "x64",
++  //   avx2: false,
++  // },
++  // {
++  //   os: "linux",
++  //   arch: "arm64",
++  //   abi: "musl",
++  // },
++  // {
++  //   os: "linux",
++  //   arch: "x64",
++  //   abi: "musl",
++  // },
++  // {
++  //   os: "linux",
++  //   arch: "x64",
++  //   abi: "musl",
++  //   avx2: false,
++  // },
+   {
+     os: "darwin",
+     arch: "arm64",
+@@ -62,20 +62,20 @@ const allTargets: {
+     os: "darwin",
+     arch: "x64",
+   },
+-  {
+-    os: "darwin",
+-    arch: "x64",
+-    avx2: false,
+-  },
+-  {
+-    os: "win32",
+-    arch: "x64",
+-  },
+-  {
+-    os: "win32",
+-    arch: "x64",
+-    avx2: false,
+-  },
++  // {
++  //   os: "darwin",
++  //   arch: "x64",
++  //   avx2: false,
++  // },
++  // {
++  //   os: "win32",
++  //   arch: "x64",
++  // },
++  // {
++  //   os: "win32",
++  //   arch: "x64",
++  //   avx2: false,
++  // },
+ ]
+ 
+ const targets = singleFlag
+-- 
+2.52.0