docs: fix non-existent marketing_agent template reference

[aiSynergy37]

Summary

• fix the template example in examples/README.md to reference an existing template
• replace examples/templates/marketing_agent with examples/templates/job_hunter
• add an optional ls examples/templates step so users can discover available templates

Why

Issue #6823 reports that marketing_agent does not exist, which breaks the getting-started flow in the examples guide.

Closes #6823

Summary by CodeRabbit

• Documentation
  • Updated template usage instructions with a clearer example source and added an optional command to list available templates for easier reference.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 19bc72e4-44a5-4479-8fd6-bfcbc45cc499

📥 Commits

Reviewing files that changed from the base of the PR and between 72091d2 and 75ab376.

📒 Files selected for processing (1)

• examples/README.md

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📝 Walkthrough

Walkthrough

Updated examples/README.md to replace a non-existent template reference (marketing_agent) with an existing one (job_hunter) and added an optional command to list available templates.

Changes

Cohort / File(s)	Summary
Documentation Update examples/README.md	Corrected template example from non-existent marketing_agent to valid job_hunter, and added optional ls examples/templates command to help users discover available templates.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A marketing agent? No such thing here!
But job_hunter templates bring users good cheer,
With ls to explore what templates we keep,
The docs now ring true—no more confusion deep! 🌟

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: fixing a non-existent marketing_agent template reference in the documentation.
Linked Issues check	✅ Passed	The PR successfully addresses issue #6823 by replacing the non-existent marketing_agent reference with job_hunter and adding a step to list available templates.
Out of Scope Changes check	✅ Passed	All changes are scoped to fixing the template reference issue; no unrelated modifications were introduced to the codebase.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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