feat: add damped-track-aim smoke-gated example

[TMHSDigital]

Summary

• Adds examples/damped-track-aim: twelve needles aim at an emissive core via Object.constraints.new('DAMPED_TRACK') (data API, not constraint ops).
• Check asserts one unmuted Damped Track per needle on TRACK_Z and evaluated local +Z alignment toward the core (dot ≥ 0.998).
• Wires gallery metadata/assets, plugin manifest, blender-smoke.yml, and bumps documented example count to 14.

Test plan

• Check-only on Blender 5.1.1 — exit 0
• Check-only on Blender 4.4.3 (local LTS proxy) — exit 0
• EEVEE still render + visual inspect (tips toward core)
• python scripts/build_gallery.py regenerated gallery pages
• py_compile + manifest/gallery asset path check
• CI blender-smoke on 4.5 LTS + 5.1
• CI validate / validate-manifest

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