Resolves conflict in .github/workflows/test.yml: keep the 6 new drift-check
steps from main (plan-scan, secrets, schema-detect, decisions,
workstream-name-policy, Shared Module hand-sync) before the split-lane test
runs from this PR. PR's dedicated `coverage` job replaces main's per-matrix
`Run tests with coverage` step.
Other conflicting files (CONTRIBUTING.md, get-shit-done/bin/lib/init.cjs,
package.json) auto-merged cleanly. Changeset files (.changeset/*) brought in
from main as adds.