Add Obsidian dev validation skill

.agents/skills/codex-panel-obsidian-dev/SKILL.md

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+---
+name: codex-panel-obsidian-dev
+description: Use when validating Codex Panel inside a live Obsidian app with the local `obsidian` CLI, including plugin reloads, command execution, DOM/CSS inspection, screenshots, captured console output, captured runtime errors, Electron devtools, CDP commands, or mobile emulation.
+---
+
+# Codex Panel Obsidian Dev
+
+Use this skill for live Obsidian checks after building Codex Panel or when investigating behavior that unit tests cannot observe.
+
+## Ground Rules
+
+- Work from the Codex Panel repository root.
+- Treat `obsidian plugin:reload id=codex-panel`, `obsidian reload`, `obsidian restart`, `obsidian devtools`, `obsidian eval`, `obsidian dev:cdp`, and `obsidian dev:mobile` as state-changing or intrusive. Ask the user before running them.
+- Prefer read-only inspection first: `plugin`, `commands`, `dev:errors`, `dev:dom`, `dev:css`, `dev:console`, `dev:screenshot`, `version`.
+- If `dev:console` reports that the debugger is not attached, ask before running `obsidian dev:debug on`.
+- Do not clear console or error buffers unless the user approves; clearing can destroy useful failure context.
+
+## Workflow
+
+1. Build the plugin when source changes need to be reflected in Obsidian:
+
+   ```bash
+   npm run build
+   ```
+
+2. Before reloading the live plugin, ask the user whether it is OK to reload their current Obsidian session. If approved:
+
+   ```bash
+   obsidian plugin:reload id=codex-panel
+   ```
+
+3. Open the relevant Codex Panel surface when needed:
+
+   ```bash
+   obsidian command id=codex-panel:open-panel
+   obsidian command id=codex-panel:open-threads-view
+   ```
+
+4. Inspect runtime health:
+
+   ```bash
+   obsidian plugin id=codex-panel
+   obsidian dev:errors
+   obsidian dev:dom selector=.codex-panel total
+   obsidian dev:css selector=.codex-panel
+   obsidian dev:screenshot path=<scratch-path>/codex-panel.png
+   ```
+
+5. Use focused selectors for the behavior under test. Prefer stable Codex Panel classes such as `.codex-panel`, `.codex-panel__composer`, `.codex-panel-threads`, and `.codex-panel-chat-turn-diff`.
+
+## Common Checks
+
+- Confirm the loaded version and enabled state:
+
+  ```bash
+  obsidian plugin id=codex-panel
+  ```
+
+- List available Codex Panel commands:
+
+  ```bash
+  obsidian commands filter=codex-panel
+  ```
+
+- Count rendered elements:
+
+  ```bash
+  obsidian dev:dom selector=.codex-panel__composer total
+  ```
+
+- Inspect text, attributes, or computed styles:
+
+  ```bash
+  obsidian dev:dom selector=.codex-panel__composer text
+  obsidian dev:dom selector=.codex-panel__composer attr=aria-label
+  obsidian dev:dom selector=.codex-panel__composer css=display
+  obsidian dev:css selector=.codex-panel__composer
+  ```
+
+- Capture a screenshot for visual review:
+
+  ```bash
+  obsidian dev:screenshot path=<scratch-path>/codex-panel.png
+  ```
+
+## Reporting
+
+Report the commands run, whether Obsidian was reloaded, key `dev:errors` or `dev:console` findings, and any screenshot path produced. If a command was skipped because it required user approval, state that plainly.

.agents/skills/codex-panel-obsidian-dev/agents/openai.yaml

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+interface:
+  display_name: "Codex Panel Obsidian Dev"
+  short_description: "Verify Codex Panel in live Obsidian"
+  default_prompt: "Use $codex-panel-obsidian-dev to reload and inspect Codex Panel in Obsidian."