fix(opencode-plugin): bind git sync and tools to the active worktree

[mislavivanda]

Summary

Part of #46 (item: plugin binds to ctx.project.worktree instead of the active worktree).

OpenCode persists project.worktree the first time a project is opened and never updates it for that project, while the active checkout is provided separately as ctx.worktree (PluginInput.worktree). Because OpenCode derives the project ID from the git remote (or a marker in the git common dir), linked worktrees of the same repo share one project — so in a git worktree add setup, ctx.project.worktree can point at a previously opened checkout instead of the one the session is actually running in.

Before this change that stale path was used as the base for all host-side git operations, so:

• sandbox setup pushed the wrong checkout's HEAD into the sandbox, and
• idle-time syncs pulled sandbox commits into the wrong checkout's opencode/N branch.

Changes

• plugins/session-events.ts: bind session event handling to ctx.worktree
• plugins/custom-tools.ts: bind sandbox tools to ctx.worktree

Persisted session state is unaffected: ProjectDataStorage.updateSession already refreshes the stored worktree on every call, and opencode/N branch allocation operates on refs in the shared git common dir, so numbering stays unique across linked worktrees.

Testing

• tsc --noEmit clean; npm run build covered by CI

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Summary by cubic

Bind git sync and sandbox tools to the active worktree to target the checkout the session is running in. Previously they used the persisted project worktree and could operate on a different checkout in linked-worktree setups; now they use ctx.worktree and land in the active checkout.

• Changes limited to packages/opencode-plugin/.opencode/plugin/daytona/plugins/session-events.ts and packages/opencode-plugin/.opencode/plugin/daytona/plugins/custom-tools.ts: both read ctx.worktree instead of ctx.project.worktree.
• In a git worktree add setup, confirm sandbox setup pushes the active checkout’s HEAD and idle-time syncs update the active checkout’s opencode/N branch.
• Persisted session state remains correct; opencode/N numbering stays unique via refs in the shared git common dir.
• No migration actions required.

^{Written for commit bdd9d56. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 2 files

_{Re-trigger cubic}