feat: deliver v1.8.0 harness reliability and parity updates

commands/model-route.md

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+# Model Route Command
+
+Recommend the best model tier for the current task by complexity and budget.
+
+## Usage
+
+`/model-route [task-description] [--budget low|med|high]`
+
+## Routing Heuristic
+
+- `haiku`: deterministic, low-risk mechanical changes
+- `sonnet`: default for implementation and refactors
+- `opus`: architecture, deep review, ambiguous requirements
+
+## Required Output
+
+- recommended model
+- confidence level
+- why this model fits
+- fallback model if first attempt fails
+
+## Arguments
+
+$ARGUMENTS:
+- `[task-description]` optional free-text
+- `--budget low|med|high` optional