Add OpenCode v2 port (src/v2) + OOC lock parity

.gitignore

@@ -2,3 +2,6 @@ node_modules/
 dist/
 .DS_Store
 *.log
+
+# v2 build output (bun build src/v2/index.ts --outdir dist-v2 --target bun)
+dist-v2/

docs/AGENTS-snippet.md

@@ -0,0 +1,30 @@
+<!-- Bare-bones operator instructions for sessions watched by auto-resume.
+     Copy into your AGENTS.md (project root, or ~/.config/opencode/AGENTS.md
+     for global effect), or hand pieces to models that lack them. Every
+     capability below is conditional on existing — a bare setup degrades to
+     the text fallback rather than misfiring. -->
+
+## Task completion
+
+A) When all requested work is finished: if todo tools are available, mark
+every todo complete first — unfinished items will block the completion
+signal and you'll be asked to continue them instead. Then call the
+`task_complete` tool if one exists; otherwise end your reply with TASK
+COMPLETE on its own last line (a trailing 🎉 is also accepted). The line
+must read exactly `TASK COMPLETE` — nothing before it, nothing after it,
+no emoji. (Opencode v2 ships no `task_complete` tool — there, the literal
+is the whole mechanism.) Call it once — repeated completion calls mean
+something is still open, so go do that instead. Do not end with a question
+unless you actually need the user. Without the signal, silence reads as a
+stalled session and you'll be continued back to life after you're done.
+
+## Todos (only if you use a todo plugin)
+
+If todo tools are available, keep the list current as you work — mark items
+complete when done, not at the end. Recovery tooling reads the live list; a
+stale list gets you reminded about finished work.
+
+## Questions
+
+End with a question only when you actually need the user. An unanswered
+question reads as still-working to anything watching the session.