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>

adapters/opencode/templates/plugin-stub.js.tmpl

@@ -0,0 +1,88 @@
+// =============================================================================
+// Generated by adapters/opencode/adapter.sh — do not edit.
+// mbifc-hooks.js — opencode plugin that dispatches events to bash hook scripts
+// =============================================================================
+// This file is generated at build time. It contains a vendored bash executor
+// (from adapters/opencode/templates/bash-executor.js) and a hook registry
+// synthesised from the source hooks/*.hook.yaml files.
+// =============================================================================
+
+// ── bash-executor.js (vendored) ─────────────────────────────────────────────
+__BASH_EXECUTOR__
+
+// ── Hook registry (generated) ───────────────────────────────────────────────
+const HOOKS = __HOOK_REGISTRY__;
+
+// ── Helpers ─────────────────────────────────────────────────────────────────
+
+/**
+ * Build the neutral JSON payload from an opencode event context.
+ * The opencode event shapes vary per event; we extract the common fields and
+ * leave everything else under `args`.
+ */
+function buildPayload(eventName, input) {
+  const tool = (input && (input.tool || input.toolName)) || "";
+  const args =
+    (input && (input.args || input.toolInput || input.input)) ||
+    (input && input.title !== undefined ? { title: input.title, message: input.message } : {}) ||
+    {};
+  const neutralEvent = (() => {
+    switch (eventName) {
+      case "tool.execute.before": return "before-tool-use";
+      case "tool.execute.after":  return "after-tool-use";
+      case "session.idle":        return "on-notification";
+      case "session.created":     return "on-session-start";
+      case "tui.prompt.append":   return "on-prompt-submit";
+      default:                    return eventName;
+    }
+  })();
+  return {
+    event: neutralEvent,
+    tool,
+    args,
+    session_id: (input && input.sessionId) || "",
+    cwd: (input && input.cwd) || process.cwd(),
+    framework: "opencode",
+  };
+}
+
+/**
+ * Check whether a hook's match-tool filter (if any) matches the current tool.
+ */
+function matchesTool(hook, tool) {
+  const m = hook.matchTool;
+  if (!m || m.length === 0) return true;
+  return m.includes((tool || "").toLowerCase());
+}
+
+// ── Plugin entry point ──────────────────────────────────────────────────────
+module.exports = async function mbifcHooksPlugin({ app, client }) {
+  // Group hooks by opencode event name
+  const byEvent = {};
+  for (const h of HOOKS) {
+    for (const trig of h.triggers) {
+      (byEvent[trig.event] ||= []).push({ ...h, matchTool: trig.matchTool });
+    }
+  }
+
+  // Register one handler per opencode event; dispatch to matching hooks.
+  const handlers = {};
+  for (const [event, hooks] of Object.entries(byEvent)) {
+    handlers[event] = async (input, output) => {
+      const payload = buildPayload(event, { ...input, ...output });
+      for (const h of hooks) {
+        if (!matchesTool(h, payload.tool)) continue;
+        const path = require("node:path");
+        const scriptAbs = path.isAbsolute(h.script)
+          ? h.script
+          : path.join(__dirname, h.script);
+        const { exitCode, stderr } = await runBashHook(scriptAbs, payload);
+        if (exitCode === 2) {
+          // Documented opencode block mechanism for tool.execute.before
+          throw new Error(`[${h.name}] blocked: ${stderr.trim() || "exit 2"}`);
+        }
+      }
+    };
+  }
+  return handlers;
+};