@W-22167805@ add sf agent trace delete command

[WillieRuemmele]

Work Item

@W-22167805@

Summary

Adds the sf agent trace delete command for deleting local trace files recorded during agent preview sessions. No org connection required.

Changes

• New command: sf agent trace delete
• Flags: --agent (substring match), --session-id, --older-than (e.g. 7d, 2w, 24h), --no-prompt
• Shows a preview table before deleting; prompts for confirmation unless --no-prompt is passed
• Messages: messages/agent.trace.delete.md
• Schema and snapshot updated

Files Changed

• src/commands/agent/trace/delete.ts
• messages/agent.trace.delete.md
• schemas/agent-trace-delete.json
• command-snapshot.json
• test/commands/agent/trace/delete.test.ts

Test Plan

• 22 unit tests passing
• npm run build and npm test pass cleanly
• Schema and deprecation snapshot regenerated

Dependencies

• Requires agents library PR: @W-22167805@ Add trace session utilities (listSessionTraces, readSessionTrace, readTurnIndex) forcedotcom/agents#273
• Stacks on top of list PR: @W-22167805@ add sf agent trace list command #409