feat: switch to opencode

install-scripts/README.md

@@ -18,10 +18,9 @@ files beneath it and install command wrappers or symlinks into `$DEV_TOOLS_DIR/b
 directory is prepended to implementation agents' `PATH`. Environment changes made by a script do
 not persist into implementation turns.
 
-The supplied `dotnet` wrapper keeps the SDK itself in `DEV_TOOLS_DIR`, but places the writable
-.NET CLI home and NuGet package cache under `/tmp`. Codex implementation sandboxes do not expose a
-normal user home and receive read-only access to installed tools, so runtime caches cannot live
-beside the SDK.
+The supplied `dotnet` wrapper keeps the SDK itself in `DEV_TOOLS_DIR` and places writable CLI state
+and NuGet caches under `DEV_TOOLS_DIR/runtime/dotnet`. OpenCode's own home is deliberately read-only
+so it cannot be used to persist global agent configuration.
 
 The configured scripts run in list order after the repository is cloned (or an existing agent PR
 branch is synchronized) and before the first implementation turn for `implement`, `iterate`, and

install-scripts/dotnet

@@ -6,6 +6,7 @@ set -eu
 
 install_dir="$DEV_TOOLS_DIR/dotnet"
 bin_dir="$DEV_TOOLS_DIR/bin"
+runtime_dir="$DEV_TOOLS_DIR/runtime/dotnet"
 installer=$(mktemp)
 trap 'rm -f "$installer"' EXIT
 
@@ -25,9 +26,9 @@ PYTHON
 printf '%s\n' \
     '#!/bin/sh' \
     "export DOTNET_ROOT='$install_dir'" \
-    'export DOTNET_CLI_HOME="${DOTNET_CLI_HOME:-/tmp/agentci-dotnet}"' \
-    'export NUGET_PACKAGES="${NUGET_PACKAGES:-/tmp/agentci-nuget/packages}"' \
-    'export NUGET_HTTP_CACHE_PATH="${NUGET_HTTP_CACHE_PATH:-/tmp/agentci-nuget/http-cache}"' \
+    "export DOTNET_CLI_HOME='$runtime_dir/home'" \
+    "export NUGET_PACKAGES='$runtime_dir/nuget/packages'" \
+    "export NUGET_HTTP_CACHE_PATH='$runtime_dir/nuget/http-cache'" \
     'export HOME="$DOTNET_CLI_HOME"' \
     'export DOTNET_CLI_TELEMETRY_OPTOUT=1' \
     'export DOTNET_SKIP_FIRST_TIME_EXPERIENCE=1' \