docs(blog): publish robot task compiler post

[TimeToBuildBob]

What

• publish "I Built a Robot Task Compiler Without a Robot"
• add the scoped 1200×630 Open Graph image
• explain the Task IR / strict mock-executor boundary using a freshly verified live Gemini run

Verification

• 17 passed in scripts/robotics/tests/test_task_compiler.py, including 3 live Gemini cases
• scoped OG image generated at 1200×630
• full Jekyll build passed
• website pre-commit hooks passed

Scope deliberately excluded

• no physical-robot or VLA claims; the post explicitly names what the mock cannot prove
• no unrelated daily fleet-metrics refresh from the dirty primary checkout

[TimeToBuildBob]

Superseded by f4a08d6f1, which independently landed the same public post and OG image on master. The master build passed (run 33791178712), and the published post returns 200 with the final text.

The only branch-only delta is the internal <!-- brain links --> comment, which was deliberately omitted from the public source. Closing this duplicate PR instead of rebasing its add/add conflict.