chore(docs): update stale version and test count references

[Alberto-Codes]

Problem

Several places reference stale numbers:

• mkdocs.yml extra.version is "0.1.0" — should be dynamically sourced or removed
• ROADMAP test count goes stale after test additions (no automated sync)

Approach

Either:

• Remove hardcoded version from mkdocs.yml extra (mkdocs-material already reads from git tags)
• Or use macros plugin to pull from pyproject.toml

For ROADMAP, accept manual updates or add a CI check.

Origin

Epic 2 retrospective tech debt items.