chore(deps): require OpenCode 1.0.69 or later

[marandaneto]

Problem

The OpenCode peer and development dependencies currently allow any version. This means tests always use the latest release, while the peer range also accepts older releases that do not provide the UserMessage.agent field used by the plugin.

Changes

• Require @opencode-ai/plugin 1.0.69 or later within the 1.x release line.
• Pin the plugin and SDK development dependencies to 1.0.69, the first version where UserMessage.agent is available.
• Add a minor changeset for the supported version range.

How did you test this code?

Automated checks run by the Pi coding agent:

• pnpm typecheck
• pnpm test (48 tests passed)
• pnpm lint
• pnpm build

The SDK type definitions for versions 1.0.68 and 1.0.69 were also compared to confirm that 1.0.69 is the first release with UserMessage.agent.

Checklist

• Tests for new code (if applicable)
• Accounted for backwards compatibility of any changes (no breaking changes!)
• Added a changeset

🤖 Agent context

Autonomy: Human-driven (agent-assisted)

Authored with the Pi coding agent using Git, pnpm, npm package metadata, and autoreview. The agent session was not shared publicly. The minimum version was selected by checking adjacent published SDK type definitions rather than choosing an arbitrary 1.x release.