feat: deliver v1.8.0 harness reliability and parity updates

.opencode/commands/loop-status.md

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+# Loop Status Command
+
+Inspect active loop state, progress, and failure signals.
+
+## Usage
+
+`/loop-status [--watch]`
+
+## What to Report
+
+- active loop pattern
+- current phase and last successful checkpoint
+- failing checks (if any)
+- estimated time/cost drift
+- recommended intervention (continue/pause/stop)
+
+## Watch Mode
+
+When `--watch` is present, refresh status periodically and surface state changes.
+
+## Arguments
+
+$ARGUMENTS:
+- `--watch` optional