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openspec/specs/queued-image-refetch-with-backoff/spec.md

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+## Purpose
+
+Canonical specification for queued-image-refetch-with-backoff requirements synced from OpenSpec change deltas.
+
+## Requirements
+
+### Requirement: Latest-30 queue construction
+The refetch-images command SHALL enqueue up to the latest 30 news items for processing.
+
+#### Scenario: Queue population
+- **WHEN** refetch-images is started
+- **THEN** the command loads recent news items
+- **AND** enqueues at most 30 items ordered from newest to oldest
+
+### Requirement: Sequential processing
+The image refetch queue SHALL be processed one item at a time.
+
+#### Scenario: Single-item worker behavior
+- **WHEN** queue processing runs
+- **THEN** only one queued item is processed concurrently
+- **AND** next item starts only after current item completes/fails
+
+### Requirement: Exponential backoff on transient failures
+The queue processor SHALL retry transient image-provider failures using exponential backoff.
+
+#### Scenario: Rate-limited provider response
+- **WHEN** provider call returns rate-limit or transient error
+- **THEN** command retries with exponential delay between attempts
+- **AND** stops retrying after configured max attempts
+
+### Requirement: Progress and completion reporting
+The command SHALL emit operator-readable progress and final summary output.
+
+#### Scenario: Queue progress output
+- **WHEN** queue processing is in progress
+- **THEN** the command prints per-item progress (processed/succeeded/failed)
+- **AND** prints final totals on completion