Claude plugin fails: `Plugin "X" not found in any configured marketplace`

Symptom: install/claude.sh logs [warn] fail <plugin>: … ✘ Failed to install plugin "<plugin>": Plugin "<plugin>" not found in any configured marketplace, but the plugin visibly exists in the marketplace’s GitHub repo.

Root cause: plugin installs resolve against the local marketplace clones under ~/.claude/plugins/marketplaces/, and with DISABLE_AUTOUPDATER=1 those never refresh themselves. A plugin added upstream after the clone date is invisible (the claude-plugins-official clone once sat 4 months stale while math-olympiad existed upstream). claude.sh used to refresh catalogs only in upgrade mode — and even that call was broken, passing a nonexistent --all flag whose error was silenced by >/dev/null || true, so no mode ever refreshed. It now refreshes (with the correct no-name form) in every mode.

Confirm — compare the clone date against upstream:

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git -C ~/.claude/plugins/marketplaces/<marketplace> log -1 --format=%cd
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jq -r '.plugins[].name' \
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  ~/.claude/plugins/marketplaces/<marketplace>/.claude-plugin/marketplace.json | grep <plugin>

Fix: update the checkout and rerun bootstrap.sh (or install/claude.sh). Manual one-off:

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claude plugin marketplace update <marketplace>
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claude plugin install <plugin>@<marketplace>