[Feature] `/autocode` to auto-enable passthrough in new threads

[oberonix]

Problem / Motivation

For most projects, I almost always want passthrough on inside any thread the bot creates — it's the natural mobile workflow. Today every new thread requires me to type /code once before I can chat normally. That's a friction point on every new task.

Proposed Solution

Add a /autocode slash command that toggles a per-project flag. When enabled, every new thread the bot creates (via /work or /opencode) automatically has passthrough mode (/code) seeded as on, so plain messages are routed to OpenCode without needing to run /code first inside each thread.

Mirrors the existing /autowork pattern: same per-project boolean shape, same toggle UX.

Alternatives Considered

Nothing else really made sense, I thought about a global setting, but I like the autowork pattern a lot

Additional Context

N/A

Are you willing to work on this?

• Yes, I'd like to implement this feature
• I can help but would need guidance
• No, I'm just suggesting the idea