`findPluginInstall()` in `scripts/harness-audit.js` scans two candidate
roots:
{rootDir}/.claude/plugins/
{HOME}/.claude/plugins/
Current Claude Code marketplace installs live one directory deeper:
{HOME}/.claude/plugins/marketplaces/{ecc,everything-claude-code}/...
As a result, running `node scripts/harness-audit.js repo` on any
consumer project reports `consumer-plugin-install: false` even when ECC
is fully installed via marketplace, costing 4 points from Tool Coverage.
Add the `marketplaces/` intermediate directory to `candidateRoots` so
both legacy and current install layouts are recognized. The change is
purely additive: existing candidate paths still resolve, and the new
ones only match when the marketplace layout is present.
Reproduction:
1. Install ECC via Claude Code plugin marketplace
2. cd into any consumer project
3. node ~/.claude/plugins/marketplaces/everything-claude-code/scripts/harness-audit.js repo
4. Observe consumer-plugin-install=false despite a working install
