Seven-task plan spanning two worktrees: Phase 1 (local-dev) for
SKILL.md instrumentation (pilot tdd, then rollout to 6 binary-outcome
skills), Phase 2 (hyperguild) for the /pass-rate endpoint + CLI
subcommand. Uses GET for the pure-read endpoint (REST semantics)
despite the brain API's POST-everywhere precedent for legacy
endpoints.
Pilot-then-rollout structure: tdd SKILL.md lands first; the
endpoint TDD task naturally exercises the new logging contract
as the dogfood validation step before the other 6 skills get
instrumented.