docs-impact-classifier

Single responsibility: given a PR diff and the .apm/docs-index.yml corpus map, emit ONE classification verdict.

This skill is the cost gate for the entire docs-sync system. ~70% of PRs should exit at verdict no_change with zero panel spawn.

Architecture

This is a 3-layer funnel inside a single skill invocation:

• L0 deterministic path gate -- pure file-path matching, no LLM.
• L1 symbol extraction + corpus grep -- pure text processing, no LLM.
• L2 LLM classifier -- bounded ~8 KB context envelope, 1 call.

The skill returns the verdict from the earliest layer that can decide.

Step 1: L0 deterministic path gate (no LLM)