fix(docs): standardize image paths to use ./screenshots/ format

All image references now consistently use relative ./screenshots/ paths
instead of mixed formats (some were /screenshots/ or screenshots/).

docs/local-manifest.md

@@ -171,7 +171,7 @@ This enables rapid iteration during playbook development.
 
 Local playbooks are visually distinguished in the Playbook Exchange with a blue "Local" badge:
 
-![Playbook Exchange with Local Badge](screenshots/playbook-exchange-list-with-local.png)
+![Playbook Exchange with Local Badge](./screenshots/playbook-exchange-list-with-local.png)
 
 - **Badge:** Blue "Local" badge next to category
 - **Tooltip:** "Custom local playbook" on hover

docs/openspec-commands.md

@@ -155,7 +155,7 @@ Access OpenSpec commands via **Settings → AI Commands** tab. Here you can:
 Commands marked with a **Maestro** badge are Maestro-specific additions to the upstream workflow.
 
 <Frame>
-  <img src="/screenshots/openspec-commands.png" alt="OpenSpec commands in the AI Commands panel" />
+  <img src="./screenshots/openspec-commands.png" alt="OpenSpec commands in the AI Commands panel" />
 </Frame>
 
 ## Auto-Updates

docs/playbook-exchange.md

@@ -25,7 +25,7 @@ The exchange displays playbooks in a searchable grid organized by category:
 Use `Cmd+Shift+[` / `Cmd+Shift+]` (`Ctrl+Shift+[/]` on Windows/Linux) to quickly switch between category tabs.
 
 <Frame>
-  <img src="/screenshots/playbook-exchange-list.png" alt="Playbook Exchange browsing view" />
+  <img src="./screenshots/playbook-exchange-list.png" alt="Playbook Exchange browsing view" />
 </Frame>
 
 ## Playbook Details
@@ -46,7 +46,7 @@ Clicking a playbook tile (or pressing `Enter`) opens the detail view where you c
 - **`Esc`** — Return to the playbook grid
 
 <Frame>
-  <img src="/screenshots/playbook-exchange-details.png" alt="Playbook Exchange detail view" />
+  <img src="./screenshots/playbook-exchange-details.png" alt="Playbook Exchange detail view" />
 </Frame>
 
 ## Importing a Playbook