chore: sync framework content from agent-runtimes main (2026-04-28)

- Hardens qwen-code-methodology rules (no code deletion, pre-commit diff)
- Fixes test-writing CLAUDE.md workspace path
- Adds best-practices-opus-repo/v1 composite harness
- Adds opus-best-practices-review task template
- Adds max_turns support to airouter task template defaults
- Updates agent-repo finalize.sh

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

harnesses/composites/best-practices-opus-repo/v1/harness.yaml

@@ -0,0 +1,10 @@
+kind: composite
+name: best-practices-opus-repo
+version: 1
+description: "Best practices review agent with Opus + repo clone via SSH"
+
+layers:
+  - context: best-practices/v1
+  - context: anthropic-cloud/v1
+  - context: gitea-ssh/v1
+  - context: agent-repo/v1