[ali92hm]

Replaces requirements.txt with [dependency-groups] dev in pyproject.toml (PEP 735), in both the repo and the template, and drops the tomli test dependency in favor of the standard library tomllib (Python 3.11+).

What changed

• pyproject.toml (both trees): new [dependency-groups] dev table with the same pins requirements.txt had. Root keeps cookiecutter/pytest-cookies for baking/testing the template; the template keeps pytest-mock instead, matching the prior intentional divergence.
• requirements.txt deleted in both trees.
• Makefile (both trees): make init is now pip install --group dev, which needs pip >= 25.1 (when the --group flag landed). No fallback or auto-upgrade step — an old pip fails loudly with a clear no such option: --group error, which is preferable to silently doing the wrong thing.
• tests/integration/test_generator.py: import tomli → import tomllib; also fixes two assertions that still expected requirements.txt/.flake8 to exist in the generated project (same class of miss as the .flake8 removal earlier), and adds a positive assertion that the rendered pyproject.toml's dev group actually contains ruff/mypy.
• Docs (CLAUDE.md, development-instructions.md, project-structure.md, tool-choices.md) and CHANGELOG.md updated to match.

.github/dependabot.yml needed no changes — verified against dependabot-core's actual parser (pyproject_document.rb checks @data.key?("dependency-groups"), with a test fixture using the same flat dev = [...] shape we use) that it already understands PEP 735.

Testing

All run locally with real pip (26.2.1), not simulated:

• pip install --group dev from a clean venv correctly resolves and installs all direct deps plus transitives
• make check-style / make check-types — pass
• make test-unit — 24/24 pass
• make test-integration — 18/18 pass
• make test-e2e (bakes the template, runs the generated project's own make init inside an isolated venv) — 2/2 pass. Inspected that venv afterward and confirmed pip install --group dev genuinely installed ruff/mypy/pytest-mock there, reading the template's own rendered pyproject.toml.
• Explicitly tested the failure mode: pip==24.0 with pip install --group dev fails immediately with no such option: --group, exit code 2.

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