docs: update parameterization tutorials for group-prior preflight

[AlexanderFengler]

Summary

• migrate the centered/non-centered tutorial to marimo and distinguish mathematical reparameterization, raw Bambi's dropped-mean graph, and HSSM's pre-build guard
• migrate the per-parameter tutorial to marimo and cover model, component-dictionary, and per-prior precedence; generated centered fallback; and centered location-ridge diagnostics
• commit output-bearing Jupyter artifacts with nine model graphs total while preserving both existing documentation routes
• publish only the Jupyter artifacts in MkDocs and retain the paired marimo files as the runnable sources of truth

Closes #1273.

Release scope

This is a documentation-only companion intended for HSSM 0.5.0. It explains the production prior policy from #1272; it does not introduce defaults, sampler behavior, or TruncatedNormal research code.

Stack

Temporarily targets codex/1225-group-only-safe-priors. After #1272 merges, this PR can be retargeted to main without changing its three tutorial commits.

Validation

• rebased onto refreshed Fix safe priors for unmatched group-only effects #1272 head 481d0ade; the two tutorial commits are patch-equivalent and the publication commit differs only by retaining current-main MkDocs source exclusions
• both marimo sources pass strict checks
• notebook inspection: 5 + 4 SVG graphs, zero errors, zero machine-local paths; all nine rendered graphs were visually checked
• documentation weight/path checks and strict MkDocs build passed
• Ruff, formatting, Pyrefly, all applicable hooks, and git diff --check passed

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