[Enhancement] One-click import: pick a Linear workspace / project / issue and pull context into OpenLoomi long-term memory

[Peefy]

Is your feature request related to a problem? Please describe.
After connecting Linear via Composio, the user expects the system to know about their projects. Today it doesn't: even with a healthy Linear connection, the agent falls back to asking the user to manually describe the project (current status, owners, deployment, branches) — defeating the purpose of connecting Linear in the first place.

Describe the solution you'd like
A guided import flow that closes the loop from "Linear is connected" to "OpenLoomi knows my project":

1. After Linear OAuth succeeds, surface an "Import project context" entry point in /connectors and as a quick-action in the chat composer.
2. UI flow:
   • Pick a workspace (auto-detected from the OAuth account by default).
   • Pick a project (or issue set, e.g. MET-17, MET-19) from a paginated list.
   • System pulls: project name/description, current cycle/iteration, in-progress issues with assignees + states, recent decisions (PR descriptions, comments), branches that mention the project, and any deployment/environment hints from issue templates.
   • System drafts a structured project memory and offers the preview → confirm → save flow (see feat: remove Discord integration completely #5, feat: enhance file previews with CSV support and drawer components #6).
   • Memory is written to data/memory/projects/<slug>.md (long-term, cross-session).

Describe alternatives you've considered

• Auto-import on first connect without preview. Rejected: too aggressive — users may have multiple workspaces and want to scope explicitly.
• A free-form chat prompt to "tell me about your project". Already supported today and is exactly the workaround we want to eliminate.

Additional context
Linear is already a canonical Loop source (SignalType.linear_issue in apps/web/lib/loop/types.ts:267) and #360 already handles multi-account. The signal-pull infrastructure is in place; what's missing is the UI to bootstrap a project memory from it.