app-server: include experimental skill metadata in exec approval requests (#13929)
## Summary
This change surfaces skill metadata on command approval requests so
app-server clients can tell when an approval came from a skill script
and identify the originating `SKILL.md`.
- add `skill_metadata` to exec approval events in the shared protocol
- thread skill metadata through core shell escalation and delegated
approval handling for skill-triggered approvals
- expose the field in app-server v2 as experimental `skillMetadata`
- regenerate the JSON/TypeScript schemas and cover the new field in
protocol, transport, core, and TUI tests
## Why
Skill-triggered approvals already carry skill context inside core, but
app-server clients could not see which skill caused the prompt. Sending
the skill metadata with the approval request makes it possible for
clients to present better approval UX and connect the prompt back to the
relevant skill definition.
## example event in app-server-v2
verified that we see this event when experimental api is on:
```
< {
< "id": 11,
< "method": "item/commandExecution/requestApproval",
< "params": {
< "additionalPermissions": {
< "fileSystem": null,
< "macos": {
< "accessibility": false,
< "automations": {
< "bundle_ids": [
< "com.apple.Notes"
< ]
< },
< "calendar": false,
< "preferences": "read_only"
< },
< "network": null
< },
< "approvalId": "25d600ee-5a3c-4746-8d17-e2e61fb4c563",
< "availableDecisions": [
< "accept",
< "acceptForSession",
< "cancel"
< ],
< "command": "/Applications/ChatGPT.app/Contents/Resources/CodexAppServer_CodexAppServerBundledSkills.bundle/Contents/Resources/skills/apple-notes/scripts/notes_info",
< "commandActions": [
< {
< "command": "/Applications/ChatGPT.app/Contents/Resources/CodexAppServer_CodexAppServerBundledSkills.bundle/Contents/Resources/skills/apple-notes/scripts/notes_info",
< "type": "unknown"
< }
< ],
< "cwd": "/Applications/ChatGPT.app/Contents/Resources/CodexAppServer_CodexAppServerBundledSkills.bundle/Contents/Resources/skills/apple-notes",
< "itemId": "call_jZp3xFpNg4D8iKAD49cvEvZy",
< "skillMetadata": {
< "pathToSkillsMd": "/Applications/ChatGPT.app/Contents/Resources/CodexAppServer_CodexAppServerBundledSkills.bundle/Contents/Resources/skills/apple-notes/SKILL.md"
< },
< "threadId": "019ccc10-b7d3-7ff2-84fe-3a75e7681e69",
< "turnId": "019ccc10-b848-76f1-81b3-4a1fa225493f"
< }
< }`
```
& verified that this is the event when experimental api is off:
```
< {
< "id": 13,
< "method": "item/commandExecution/requestApproval",
< "params": {
< "approvalId": "5fbbf776-261b-4cf8-899b-c125b547f2c0",
< "availableDecisions": [
< "accept",
< "acceptForSession",
< "cancel"
< ],
< "command": "/Applications/ChatGPT.app/Contents/Resources/CodexAppServer_CodexAppServerBundledSkills.bundle/Contents/Resources/skills/apple-notes/scripts/notes_info",
< "commandActions": [
< {
< "command": "/Applications/ChatGPT.app/Contents/Resources/CodexAppServer_CodexAppServerBundledSkills.bundle/Contents/Resources/skills/apple-notes/scripts/notes_info",
< "type": "unknown"
< }
< ],
< "cwd": "/Users/celia/code/codex/codex-rs",
< "itemId": "call_OV2DHzTgYcbYtWaTTBWlocOt",
< "threadId": "019ccc16-2a2b-7be1-8500-e00d45b892d4",
< "turnId": "019ccc16-2a8e-7961-98ec-649600e7d06a"
< }
< }
```
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