fix(docs): cap sphinxcontrib-typer <0.9.1 (0.9.1 needs typer.rich_utils.STYLE_TYPES)

[ubmarco]

Problem

sphinxcontrib-typer 0.9.1 (released after #84) imports
typer.rich_utils.STYLE_TYPES, which does not exist in the typer<0.26.8 range
pinned by #84. Any fresh docs build now resolves sphinxcontrib-typer 0.9.1 and
fails during sphinx-build:

AttributeError: module 'typer.rich_utils' has no attribute 'STYLE_TYPES'

This affects main and every open PR (e.g. #85) on a fresh dependency
resolution. Note #84 capped typer for a different removed attribute
(STYLE_METAVAR); this is a new break originating from the sphinxcontrib-typer
side.

Fix

Cap sphinxcontrib-typer>=0.5.1,<0.9.1. 0.9.0 builds cleanly with the capped
typer 0.26.7; verified locally that sphinx-build -nW no longer raises the
AttributeError.

Dependency-only change — no source, tests, or typing impact.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.40%. Comparing base (79656f4) to head (d32e59f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #86   +/-   ##
=======================================
  Coverage   91.40%   91.40%           
=======================================
  Files          34       34           
  Lines        3012     3012           
  Branches      322      322           
=======================================
  Hits         2753     2753           
  Misses        160      160           
  Partials       99       99           

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