Meeting prep: inline attendee notes under upcoming meetings

[Gagancreates]

What

Adds meeting prep to the Meetings view: for an upcoming meeting, it resolves the attendees against the knowledge base and shows each person's person.md inline — deterministically, no LLM in the hot path.

• The next meeting auto-expands its prep; every other meeting with attendees gets a ✦ Prep toggle that resolves lazily on open.
• Notes-first: attendees with a note render as expandable rows (rendered markdown + "Open note"); the rest collapse into a "N others — no notes yet" row with a Create note action that hands off to the Copilot (scheduled-meeting attendees are exempt from the note-creation email-reply gate, so this generally succeeds).
• Companies: external organizations in the meeting (resolved from attendee email domains, excluding your own domain) are surfaced as their own notes.

How it works

• New core resolver resolveMeetingPrep() (packages/core/src/knowledge/meeting_prep.ts) + meeting-prep:resolve IPC. Matches email-exact first, then an unambiguous name/alias match (display names normalized to strip (via …) suffixes).
• Reads a cached knowledge index instead of rescanning the whole knowledge/ dir on every resolve; the cache is invalidated whenever a file under knowledge/ changes (wired to the workspace watcher).

Incidental fix

extractField in the knowledge index consumed newlines after a field label, so an empty field (e.g. **Role:**) bled the next line's value. Restricted it to spaces/tabs so empty fields resolve to undefined. Also strips the folder prefix from link targets for display (Organizations/Rowboat Labs → Rowboat Labs).

Test

Open the Meetings view; prep appears under the next meeting, and any meeting row exposes a Prep toggle. Verified: npm run deps, tsc --noEmit (main + renderer), and npm run lint all clean (no new errors).

Notes / follow-ups

• A PLAN.md at the repo root documents the design decisions.
• Not in scope (discussed): an opt-in LLM-synthesized brief (recent activity + agenda) and a proactive pre-meeting nudge.