Harden peer-review navigation, reader experience, and citation paths

[GoGoKo699]

Purpose

This is a repository-facing sanity pass for peer-review use, first-time readers, and future citation.

Changes

• disambiguate the prospectively frozen internal confirmation from an external replication;
• map the implementation name problem_tree explicitly to the documented maximum-|J| tree (MAXJ);
• add the classical Chow–Liu tree-approximation boundary and explain why MAXJ is not a KL-optimality claim;
• make reproduction commands root-relative in all study entry points;
• add citation sections to the primary experiment and every supporting-study README;
• distinguish citation of the primary v1.0.0 result from the expanded Version 1.1.0 archive;
• refresh the stale packaged repository-validation record to include all five scientific validators;
• add regression tests for deep citation routes, terminology, and validation-record freshness.

Scientific scope

No numerical result, frozen source file, primary comparison, effect estimate, or interpretation boundary is changed.

Remaining release action

The repository already has release v1.0.0 for the primary confirmed result. Version 1.1.0 citation guidance now requires either a matching release tag when one is published or the full commit SHA, so citations remain unambiguous in either case.