fix(router): skip git fetch/checkout when /workspace has uncommitted changes

[mrsimpson]

Summary

• Session pods crashloop in Init:0/1 when the PVC at /workspace carries uncommitted edits from a prior session — git checkout aborts with error: Your local changes to the following files would be overwritten by checkout.
• Detect a dirty workspace (any tracked diff or non-ignored untracked file) in the init script and skip the git fetch + checkout phase entirely when present.
• The workspace was initialized on an earlier pod start so the pod can come up against the existing state. To get back onto the session branch the user commits/discards the changes from inside the pod and restarts.

Why this approach (vs. auto-stash)

Considered stashing the uncommitted work and either popping it or leaving it in the stash list. Rejected because:

• Auto-pop can hit merge conflicts after the checkout, leaving the workspace in an unmerged state that opencode then has to work in.
• Stash without pop preserves work but pollutes git stash list on every restart and makes it non-obvious to the user where their edits went.
• Skip-on-dirty preserves the user's mental model ("my work is right where I left it"), needs no stash bookkeeping, and is a smaller diff. A fresh-clone workspace is never dirty so the first-start path is unchanged.

Trade-off: if the session annotation says branch X but the workspace was left on branch Y, the pod silently starts on Y. In practice this is unlikely because each session pod is hash-scoped to a single branch — but worth knowing.

Repro

Init container logs from a pod hitting this in production:

error: Your local changes to the following files would be overwritten by checkout:
	packages/opencode-router-app/src/api.ts
	packages/opencode-router-app/src/app.tsx
	...
Please commit your changes or stash them before you switch branches.
Aborting

Test plan

• bun test src/pod-manager.test.ts — 67 pass (1 new test added asserting the dirty-workspace guard wraps fetch and both checkout branches)
• bun run typecheck — clean
• Manual: kill an existing session pod with uncommitted edits in its PVC, confirm the new pod starts and the init container logs opencode-init: uncommitted changes detected in /workspace; skipping git fetch/checkout to preserve work

🤖 Generated with Claude Code