Add Head of Strategic Growth position

[kilo-code-bot]

Summary

• Adds a new "Head of Strategic Growth" position entry to handbook/company/open-positions.yml, fully commented out with YAML # comment syntax so it does not appear live on the website.
• The position focuses on Fleet's largest and most complex revenue opportunities, including large enterprise organizations, strategic technology alliances, and OEM platform partnerships.
• Follows the same structure/format as other commented-out positions in the file.
• Updated hiring manager fields to Chaz MacLaughlin.

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