Add comprehensive skills, agents, commands collection

- Added 44 external skills from obra/superpowers, ui-ux-pro-max-skill, claude-codex-settings
- Added 8 autonomous agents (commit-creator, pr-creator, pr-reviewer, etc.)
- Added 23 slash commands for Git/GitHub, setup, and plugin development
- Added hooks for code formatting, notifications, and validation
- Added MCP configurations for Azure, GCloud, Supabase, MongoDB, etc.
- Added awesome-openclaw-skills registry (3,002 skills referenced)
- Updated comprehensive README with full documentation

Sources:
- github.com/obra/superpowers (14 skills)
- github.com/nextlevelbuilder/ui-ux-pro-max-skill (1 skill)
- github.com/fcakyon/claude-codex-settings (29 skills, 8 agents, 23 commands)
- github.com/VoltAgent/awesome-openclaw-skills (registry)
- skills.sh (reference)
- buildwithclaude.com (reference)

skills/external/supabase-tools-supabase-usage/references/rls.md

@@ -0,0 +1,107 @@
+# Row Level Security (RLS)
+
+RLS controls data access at the row level based on the authenticated user.
+
+## Enabling RLS
+
+```sql
+alter table public.posts enable row level security;
+```
+
+## Policy Types
+
+| Operation | Clause                 | Purpose                          |
+| --------- | ---------------------- | -------------------------------- |
+| SELECT    | `using`                | Filter which rows can be read    |
+| INSERT    | `with check`           | Validate new rows                |
+| UPDATE    | `using` + `with check` | Filter + validate                |
+| DELETE    | `using`                | Filter which rows can be deleted |
+
+## Common Policy Patterns
+
+**1. User owns row:**
+
+```sql
+create policy "Users can view own data" on profiles
+to authenticated
+using ( (select auth.uid()) = user_id );
+
+create policy "Users can update own data" on profiles
+to authenticated
+using ( (select auth.uid()) = user_id )
+with check ( (select auth.uid()) = user_id );
+```
+
+**2. Public read, owner write:**
+
+```sql
+create policy "Public read" on posts
+for select using (true);
+
+create policy "Owner can modify" on posts
+for all to authenticated
+using ( (select auth.uid()) = author_id );
+```
+
+**3. Team/organization access:**
+
+```sql
+create policy "Team members can view" on documents
+to authenticated
+using (
+  team_id in (
+    select team_id from team_members
+    where user_id = (select auth.uid())
+  )
+);
+```
+
+**4. Role-based access:**
+
+```sql
+create policy "Admins can do anything" on posts
+to authenticated
+using (
+  exists (
+    select 1 from users
+    where id = (select auth.uid()) and role = 'admin'
+  )
+);
+```
+
+## RLS Performance Tips
+
+**Always use `(select auth.uid())` instead of `auth.uid()`:**
+
+```sql
+-- SLOW (recalculates per row)
+using ( auth.uid() = user_id )
+
+-- FAST (calculates once, 99%+ improvement)
+using ( (select auth.uid()) = user_id )
+```
+
+**Add indexes on RLS columns:**
+
+```sql
+create index idx_posts_user_id on posts using btree (user_id);
+create index idx_documents_team_id on documents using btree (team_id);
+```
+
+**Specify roles with `TO`:**
+
+```sql
+-- Good: policy only applies to authenticated users
+create policy "..." on posts to authenticated using (...);
+
+-- Bad: policy applies to all roles including anon
+create policy "..." on posts using (...);
+```
+
+## Viewing Policies
+
+```sql
+select schemaname, tablename, policyname, permissive, roles, cmd, qual, with_check
+from pg_policies
+where tablename = 'your_table';
+```