fix(orchestrator): reconcile stale supervisor snapshots

[bede-oai]

Context

Linear corrections can leave Symphony issue snapshots stuck in stale hold states, which keeps dispatch blocked.

TL;DR

Reconcile stale supervisor snapshots against fresh Linear state before dispatching work.

Summary

• Add supervisor snapshot reconciliation for stale human-review and blocked workspace states.
• Reopen dispatchable issues without manual filesystem edits when Linear now says they are actionable.
• Document the operator check path and add regression coverage for stale, real-hold, and malformed cases.

Alternatives

• Keep requiring manual snapshot cleanup, which leaves the queue vulnerable to control-plane drift.

Test Plan

• mise exec -- make all from elixir/
• mix test test/symphony_elixir/workspace_and_config_test.exs