chore: bundle internal data files in wheel (taxonomy.yaml, Jinja2 templates)

[shaypal5]

Problem

The wheel build config only lists packages = ["synthbanshee"] with no data-file includes.
Two categories of internal data are at risk:

1. configs/taxonomy.yaml — loaded at runtime by synthbanshee/config/taxonomy.py via a
   path relative to __file__. When installed from a wheel into site-packages, this relative
   path (../../configs/taxonomy.yaml) will not resolve and the CLI will fail.

2. Jinja2 / text templates inside synthbanshee/script/templates/ — these are inside the
   package directory, but Hatch won't include non-.py files unless explicitly declared.

Note: the top-level configs/scenes/, configs/speakers/, and configs/acoustic_scenes/
directories are user-authored and are NOT meant to be bundled.

Proposed fix

• Move configs/taxonomy.yaml into the package (e.g. synthbanshee/data/taxonomy.yaml) and
  load it via importlib.resources so it is always available when the package is installed.
• Add Hatch include rules for synthbanshee/**/*.j2, synthbanshee/**/*.txt, and the new
  synthbanshee/data/taxonomy.yaml.

Raised by

Copilot review comment on PR #3.