* prototype(plugins): show per-plugin auth alerts from live MCP checks
Place the shared alert beneath the individual plugin hero on main 018639af3b. Read a real Notion HTTP OAuth challenge and use a Notion-specific read-only account probe for the local stdio server. Keep the app inventory isolated and the prototype out of production imports.
* prototype(plugins): simplify auth alerts to one line
* feat(plugins): connect detail auth alerts to MCP OAuth
* fix(plugins): align auth alert with the main content column
* feat(plugins): show installed accounts and credential sections
* fix(plugins): use the supported credential projection copy
* feat(plugins): simplify setup states and retain edit actions
* fix(plugins): reuse MCP ownership across inspections
* fix(plugins): keep MCP cache types in the metadata owner
* test(plugins): preserve real install failure classification in fixtures
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