Uses the latest stable pre-hop wavelength history in the same laser and target-operation epoch. The return frequency is frozen before any write. No branch map or stored physical mode identifier is required.
The owner executes one relative-current-route algorithm. A matching frequency/context specialization selects its parameters; absent or ambiguous specializations use the explicitly configured fallback route. The complete path is validated before writes. TEC and PZT are held. All owner bounds, lease and write-verification rules remain.
Return success requires fresh frequency samples inside the configured tolerance for the specified count and duration. Optical quality is reported separately. This card does not enable PI; capture and lock restart are separate operations. A new foreground request supersedes the recovery without restoring an old target.
Missing stable pre-hop history, expired evidence or unknown write outcomes stop the procedure with an explicit reason. Historical class-based and map-replay policies require migration and are not silently substituted.