v0.1.3 - Harness review sub-agent routing fix

Patch release for /harness review reviewer-mode routing. This keeps the command diagnostic-only while making subagent availability and fallback reporting harder to skip silently.

Added

• Explicit /harness review sub-agent invocation mode for read-only reviewer subagent use when the active runtime and tool instructions allow it.
• Review report Invocation, Reviewer mode, and Fallback reason fields in the template and example report.
• Regression coverage for subagent fallback guidance, prompt drift, localized README wiring, and route precedence.

Changed

• Clarified /harness review fallback behavior when a subagent tool is present but not permitted by active tool instructions.
• Routed /harness review sub-agent before the generic /harness review command in agent-facing prompts and command routing.

Validation

• python3 -m unittest discover -s tests
• python3 -m py_compile scripts/apply_harness.py scripts/check_docs_drift.py scripts/check_structure.py scripts/check_encoding_hygiene.py scripts/check_effectiveness_plan.py scripts/harness_doctor.py
• python3 scripts/check_docs_drift.py
• python3 scripts/check_structure.py
• python3 scripts/check_encoding_hygiene.py
• python3 scripts/check_effectiveness_plan.py
• python3 scripts/harness_doctor.py --target .