Plugin browse/install listings are enriched with each plugin's real metadata

What

• Building the plugin suggestion/browse list now resolves each plugin's entry through a new async enrichment step (Lce) per marketplace, instead of iterating the raw marketplace plugin list directly. This resolves each plugin's install location against local dev overrides and rewrites the displayed entry accordingly; the same step runs after a single-plugin install/refresh.
• The claude plugin list available-plugins path now uses this same batched lookup helper and filters out plugins that fail an install-eligibility check, rather than iterating the marketplace's plugin list entry by entry.
• When a marketplace entry omits fields like displayName, description, author, homepage, repository, license, or keywords, Claude Code now fetches the plugin's source and reads its .claude-plugin/plugin.json to fill those fields in for display.

Why Plugin listings previously showed whatever sparse metadata a marketplace entry happened to include, and could point at the wrong install location for locally-overridden dev plugins. This makes browsing and installing plugins show more complete, accurate information without each marketplace having to duplicate every field.