Implement opencode adapter.

Co-Authored-By: win0na <winnie@winneon.moe>

feat(lib.sh): add install_plugins helper for opencode JS plugins

build(adapters): opencode adapter skeleton with capability/event tables

build(opencode): adapter_translate_dispatcher (DISPATCHER.md → AGENTS.md)

build(opencode): adapter_translate_references and adapter_translate_skills

Implements Task 4 and Task 5:
- adapter_translate_references: Copies reference markdown files to .opencode/references/
- adapter_translate_skills: Copies skill SKILL.md files to .opencode/skills/<name>/ with exclude filtering

Both functions respect framework filtering via should_include().

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

build(opencode): adapter_translate_agents with capability→permission mapping

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

build(opencode): bash-executor template for spawning hook scripts

build(opencode): plugin-stub template for mbifc-hooks.js

build(opencode): adapter_translate_hooks with JS plugin generation

Implements _oc_hook_registry_json and adapter_translate_hooks in the
opencode adapter. Copies hook scripts to .opencode/hooks/, generates a
single .opencode/plugins/mbifc-hooks.js by inlining bash-executor.js and
synthesising a hook registry from *.hook.yaml files. Uses python3 for
template substitution to safely handle multi-line JS content. Adds 3
unit tests (copies scripts, registry entries, noop when no hooks dir).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

build(opencode): adapter_translate_mcp with local/remote handling

build(opencode): adapter_finalize and complete adapter_build wiring

Add adapter_finalize placeholder and wire adapter_translate_mcp into
adapter_build; add end-to-end integration test (14/14 pass).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

feat(launchme): branch on --framework for opencode install layout

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

feat(updateme): branch on --framework for opencode install layout

Mirror the same case "$FRAMEWORK" block from launchme.sh: framework-specific
DIST_COMPONENTS_DIR, VAULT_COMPONENTS_DIR, DISPATCHER_SRC/DST, MCP_SRC/DST,
HAS_PLUGINS; conditional install_plugins; conditional install_settings;
framework-aware vault-setup check; framework-neutral summary messages.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

scripts/lib.sh

@@ -376,6 +376,30 @@ install_hooks() {
   printf '%d' "$count"
 }
 
+# install_plugins <src_dir> <dst_dir>
+# Copies *.js plugin files from src to dst. Mirrors install_hooks but for
+# opencode plugins (the opencode framework expects JavaScript files under
+# .opencode/plugins/). Tracked in the manifest under key "plugins".
+install_plugins() {
+  local src_dir="$1" dst_dir="$2"
+  local count=0 manifest=()
+  [[ -d "$src_dir" ]] || { printf '0'; return 0; }
+  mkdir -p "$dst_dir"
+  for src in "$src_dir/"*.js; do
+    [[ -f "$src" ]] || continue
+    local name; name="$(basename "$src")"
+    local dst="$dst_dir/$name"
+    manifest+=("$name")
+    copy_if_changed "$src" "$dst"
+    if [[ $_LAST_CHANGED -eq 1 ]]; then
+      [[ $VERBOSE_COPY -eq 1 ]] && info "Updated plugin: $name" || true
+      count=$((count + 1))
+    fi
+  done
+  manifest_write "plugins" "${manifest[@]}"
+  printf '%d' "$count"
+}
+
 # install_settings <src_json> <dst_dir>
 # Always syncs settings.json from src to dst when they differ.
 # Creates a .bak of the previous version so users can recover custom entries.