feat: deliver v1.8.0 harness reliability and parity updates

commands/quality-gate.md

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+# Quality Gate Command
+
+Run the ECC quality pipeline on demand for a file or project scope.
+
+## Usage
+
+`/quality-gate [path|.] [--fix] [--strict]`
+
+- default target: current directory (`.`)
+- `--fix`: allow auto-format/fix where configured
+- `--strict`: fail on warnings where supported
+
+## Pipeline
+
+1. Detect language/tooling for target.
+2. Run formatter checks.
+3. Run lint/type checks when available.
+4. Produce a concise remediation list.
+
+## Notes
+
+This command mirrors hook behavior but is operator-invoked.
+
+## Arguments
+
+$ARGUMENTS:
+- `[path|.]` optional target path
+- `--fix` optional
+- `--strict` optional