R19.3: No dead commented-out code

Short answer: Remove obsolete commented code blocks prior to PR merge. Commented-out code goes stale, and git already keeps the old version.

Group: Clean code. Status: stable. Generated from the rule definitions; do not edit by hand.

Playground: https://brevio.pro/tools/agent-guard-playground?rule=R19.3

What it catches

No dead commented-out code: remove obsolete commented code blocks prior to PR merge.

Why

Commented-out code goes stale, and git already keeps the old version.

A bad example

# old_call(x)
new_call(x)

A good example

new_call(x)

How it is checked

Nothing yet. No scanner and no slice card checks it: it is a standing rule for authors and reviewers.

How to silence it

A person can silence one finding with brevio-core: ignore R19.3 -- reason on the line or the line above. Without the reason it does not count. An agent cannot silence it: the agent hook and the MCP tools never honour the comment, and a pull request that adds one is reported until a reviewer allows it. Fixing the code is still the better answer.

To change what the rule flags, edit its definition in dev_rules.py or code_rules/__init__.py. That is a code change and is reviewed like one.

R19.4 Descriptive variable naming
R19.1 Function length limit
R19.2 Cyclomatic complexity bounding
Every rule