chore(repo): back-merge main into dev after v0.2.16 release (#252)

[w7-mgfcode]

Brings the v0.2.16 release commits from main back into dev so the next dev → main release PR doesn't conflict on CHANGELOG.md / .release-please-manifest.json / pyproject.toml.

What this brings to dev:

• 7f7bd15 — Merge PR chore(main): release 0.2.16 #254 (release 0.2.16)
• e54b44a — docs(docs): capitalize XGBoost in v0.2.16 changelog entry
• 2778c0f — chore(main): release 0.2.16 (CHANGELOG + manifest + pyproject 0.2.15 → 0.2.16)
• 689ac94 — Merge PR feat(release): ship the MLZOO advanced ML model zoo (A–C2) to main (#252) #253 (dev → main)

Diff: 3 files changed — CHANGELOG.md (+35), .release-please-manifest.json (0.2.15 → 0.2.16), pyproject.toml (0.2.15 → 0.2.16).

Merge instruction: ⚠️ Must be merged with --merge (a real merge commit), never squashed — otherwise main never becomes a dev ancestor and the next dev→main release PR keeps re-conflicting. See docs/_base/RUNBOOKS.md and the prior back-merge memory.

Refs #252.

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