Follow up bundled marketplace cleanup for stale organizationMcps contract #62

Context

PR #11 switches marketplace loading to bundled local assets and removes the organization-backed marketplace path from MarketplaceManager.getMarketplaceItems(), but the response shape still carries organizationMcps and returns an empty array.

This came up in review here: #11 (comment)

Follow-up

• confirm whether organization-specific marketplace MCPs are intentionally no longer supported in the bundled marketplace flow
• if they are gone, remove the stale organizationMcps contract from the extension host response, UI state, tests, and related strings
• if the field needs to stay for compatibility, document that explicitly and explain why it remains empty in this path

Why this should be tracked

Leaving the field in place as a permanent empty array makes the contract harder to reason about and obscures whether organization MCPs are deprecated or just temporarily absent.