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Chris Lu
d2b9f53edb
Adds a Config.Walker callback that fires on rule-content edit / partition flip BEFORE the cursor rewinds, so already-due objects across the rewritten rule set get caught instead of waiting on meta-log replay alone. The callback receives engine.RecoveryView(snap) and the per-shard ID; nil disables it (Phase 4a behavior preserved). Decoupling the wiring from the implementation: the handler-side WalkerFunc that drives bootstrap.Walk via the filer is the follow-up commit, and tests can stub the callback without standing up the full filer/client/lister harness. Tests pin: walker fires exactly once on hash mismatch, walker error propagates and leaves the cursor unchanged, nil Walker is a no-op.