feat: add Supabase migration SQL for team data store

- 001_teams.sql: teams + team_members + RLS
- 002_eval_runs.sql: eval results with universal format, indexes, upsert key
- 003_data_tables.sql: retro, QA, ship, greptile, transcripts + RLS

All tables use RLS: team members read/insert, admins delete.
Transcript table has tighter policy (admin-only read).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

supabase/migrations/001_teams.sql

@@ -0,0 +1,44 @@
+-- 001_teams.sql — Core team infrastructure.
+--
+-- Creates teams and team_members tables with RLS policies.
+-- Must be run first — other tables reference teams.
+
+-- Teams
+create table if not exists teams (
+  id uuid primary key default gen_random_uuid(),
+  name text not null,
+  slug text not null unique,
+  created_at timestamptz default now()
+);
+
+-- Team membership
+create table if not exists team_members (
+  team_id uuid references teams(id) on delete cascade,
+  user_id uuid references auth.users(id) on delete cascade,
+  role text not null default 'member' check (role in ('owner', 'admin', 'member')),
+  primary key (team_id, user_id)
+);
+
+-- RLS for teams
+alter table teams enable row level security;
+
+create policy "team_members_read_team" on teams
+  for select using (
+    id in (select team_id from team_members where user_id = auth.uid())
+  );
+
+-- RLS for team_members
+alter table team_members enable row level security;
+
+create policy "members_read_own_team" on team_members
+  for select using (
+    team_id in (select team_id from team_members where user_id = auth.uid())
+  );
+
+create policy "admins_manage_members" on team_members
+  for all using (
+    team_id in (
+      select team_id from team_members
+      where user_id = auth.uid() and role in ('owner', 'admin')
+    )
+  );