nightly_0.1.16

docs: add Obsidian-style wiki links to knowledge-base

- platform files: replace [[]] with {{}} for cross-platform links,
  remove [[ ]] from private config references (plain text)
- private files: keep [[]] for private-to-private links, add {{}}
  for links pointing to platform files (embodied, sim2real, etc.)
- _index_physics: add embodied AI, medical, and platform sections
- trajectory_optimization: remove stray {{ control_theory }} artifact

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>