What does this PR do?

Adds --model support to hermes cron create and hermes cron edit, and surfaces the configured model in CLI output.

The cronjob tool already supports per-job model overrides, but the standalone CLI subcommands did not expose that capability.

Related Issue

Fixes #8207

Type of Change

• ✨ New feature (non-breaking change that adds functionality)
• ✅ Tests (adding or improving test coverage)
• 📝 Documentation update

Changes Made

• hermes_cli/main.py
  • added --model to hermes cron create
  • added --model to hermes cron edit
• hermes_cli/cron.py
  • pass model through to the cronjob tool on create/update
  • show Model: in create/edit/list output when a per-job override exists
• tests/hermes_cli/test_cron.py
  • added coverage for creating jobs with a model override
  • added coverage for editing/clearing a job model override
  • added coverage for list output including the model
• website/docs/user-guide/features/cron.md
  • documented --model examples for create/edit

How to Test

1. Create a cron job with a pinned model:

   hermes cron create "every 1h" "Run a task" --model openai/gpt-5.4-mini

2. Edit an existing job to change the model:

   hermes cron edit <job_id> --model anthropic/claude-sonnet-4.6

3. Run hermes cron list and verify the model is shown for jobs that have an override.

Or run:

python -m pytest tests/hermes_cli/test_cron.py -q -n0

Checklist

Code

• I've read the Contributing Guide
• My commit messages follow Conventional Commits
• I searched for existing PRs to make sure this isn't a duplicate
• My PR contains only changes related to this fix/feature
• I've run relevant pytest coverage locally
• I've added tests for my changes
• I've tested on my platform:
  • macOS

Documentation & Housekeeping

• I've updated relevant documentation
• N/A — no config schema changes
• I've considered cross-platform impact
• N/A — no tool schema changes