feat: deliver v1.8.0 harness reliability and parity updates

commands/loop-start.md

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+# Loop Start Command
+
+Start a managed autonomous loop pattern with safety defaults.
+
+## Usage
+
+`/loop-start [pattern] [--mode safe|fast]`
+
+- `pattern`: `sequential`, `continuous-pr`, `rfc-dag`, `infinite`
+- `--mode`:
+  - `safe` (default): strict quality gates and checkpoints
+  - `fast`: reduced gates for speed
+
+## Flow
+
+1. Confirm repository state and branch strategy.
+2. Select loop pattern and model tier strategy.
+3. Enable required hooks/profile for the chosen mode.
+4. Create loop plan and write runbook under `.claude/plans/`.
+5. Print commands to start and monitor the loop.
+
+## Required Safety Checks
+
+- Verify tests pass before first loop iteration.
+- Ensure `ECC_HOOK_PROFILE` is not disabled globally.
+- Ensure loop has explicit stop condition.
+
+## Arguments
+
+$ARGUMENTS:
+- `<pattern>` optional (`sequential|continuous-pr|rfc-dag|infinite`)
+- `--mode safe|fast` optional