Drop unused undici direct dependencies
What
packages/aft-bridge and packages/opencode-plugin both declared undici as a direct dependency, but nothing in either package imports it — no undici import exists anywhere under packages/ or crates/. Both declarations are removed and bun.lock is regenerated.
With the direct range gone, the lockfile keeps a single hoisted undici (8.5.0) that @earendil-works/pi-coding-agent already requires, instead of pinning 7.25.0 at the root for a dependency nobody uses.
Verification
bun install --frozen-lockfile passes against the updated lockfile.
Closes #1369
Summary by cubic
Removes the unused direct undici dependencies from packages/aft-bridge and packages/opencode-plugin. Neither package imports undici, so the lockfile now hoists a single undici 8.5.0, the version pi-coding-agent already requires.
The lockfile change is scoped to the undici entries only; the regenerated entries for published platform packages and the Pi plugin's unresolved list were reverted since they would go stale at the next version bump.