fix(setup): copy lib/ into opencode runtime root

[netkurt]

The create_opencode_runtime_root function (used by ./setup --host opencode) links/copies bin/, browse/, design/, ETHOS.md, and several other files into the opencode install root, but does not include lib/. As a result, any .ts script in bin/ that imports from ../lib/... (e.g. gstack-gbrain-detect, gstack-decision-*, gstack-redact, gstack-telemetry-log, gstack-memory-ingest, etc.) fails on opencode hosts with errors like:

error: Cannot find module '../lib/gbrain-local-status' from '.../bin/gstack-gbrain-detect.ts'

This patch mirrors the existing bin/ block to also link/copy lib/, and adds lib/ to the mkdir list so the directory is created on a clean install.

Reproduction

Before the patch, on a fresh ./setup --host opencode install:

$ bun run ~/.config/opencode/skills/gstack/bin/gstack-gbrain-detect.ts
error: Cannot find module "../lib/gbrain-local-status" from ".../bin/gstack-gbrain-detect.ts"

After the patch, the same command runs and returns the detection JSON.

Diff

--- a/setup
+++ b/setup
@@ -866,7 +866,7 @@ create_opencode_runtime_root() {
     rm -rf "$opencode_gstack"
   fi
 
-  mkdir -p "$opencode_gstack" "$opencode_gstack/browse" "$opencode_gstack/design" "$opencode_gstack/gstack-upgrade" "$opencode_gstack/review" "$opencode_gstack/qa" "$opencode_gstack/plan-devex-review"
+  mkdir -p "$opencode_gstack" "$opencode_gstack/browse" "$opencode_gstack/design" "$opencode_gstack/gstack-upgrade" "$opencode_gstack/lib" "$opencode_gstack/review" "$opencode_gstack/qa" "$opencode_gstack/plan-devex-review"
 
   if [ -f "$opencode_dir/gstack/SKILL.md" ]; then
     _link_or_copy "$opencode_dir/gstack/SKILL.md" "$opencode_gstack/SKILL.md"
@@ -874,6 +874,9 @@ create_opencode_runtime_root() {
   if [ -d "$gstack_dir/bin" ]; then
     _link_or_copy "$gstack_dir/bin" "$opencode_gstack/bin"
   fi
+  if [ -d "$gstack_dir/lib" ]; then
+    _link_or_copy "$gstack_dir/lib" "$opencode_gstack/lib"
+  fi
   if [ -d "$gstack_dir/browse/dist" ]; then
     _link_or_copy "$gstack_dir/browse/dist" "$opencode_gstack/browse/dist"
   fi

Test

Smoke test (Windows + Git Bash): extract the function with sed, eval it, call it against a synthetic install root. lib/ is created with gbrain-local-status.ts and the other 15 lib/*.ts files. bin/ and ETHOS.md paths still work. Test script at C:\Users\Kurt\AppData\Local\Temp\opencode\oc-test\test.sh (not part of the PR).

Tested on gstack v1.58.5.0 (the local .last-setup-version reported by gstack-gbrain-detect matches upstream main).

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[time-attack]

@16francej — recommend closing this PR as superseded by #2262. It fixes the missing-library defect only for OpenCode, while #2262 applies the shared runtime-library requirement across all selective host roots with broader tests. Credit #2198 for the OpenCode reproduction, and avoid landing this partial overlap before #2262 is corrected and tested.