Remove redundant pyproject.toml existence checks

[Copilot]

Both bump.sh, release.sh, and the Makefile check for pyproject.toml existence before proceeding. This is redundant as upstream validation ensures the file exists.

Changes

• Removed pyproject.toml existence check from .rhiza/scripts/bump.sh
• Removed pyproject.toml existence check from .rhiza/scripts/release.sh
• Removed pyproject.toml existence check from Makefile install target
• Removed pyproject.toml existence check from Makefile deptry target
• Added clarifying comment in Makefile explaining the pyproject.toml assumption

The scripts and Makefile targets now proceed directly to their core functionality, reducing defensive checks that add no value.

[!WARNING]

Original prompt

---

This section details on the original issue you should resolve

<filter_complete></filter_complete>

<issue_title>Remove the constant checks if there is a pyproject.toml file</issue_title>
<issue_description>You can assume the file exists as validate would throw an error otherwise</issue_description>

Comments on the Issue (you are @copilot in this section)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Remove the constant checks if there is a pyproject.toml file</issue_title>
<issue_description>You can assume the file exists as validate would throw an error otherwise</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Remove the constant checks if there is a pyproject.toml file #151

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[tschm]

@copilot remove from the Makefile

[Copilot]

@copilot remove from the Makefile

Done. Removed pyproject.toml existence checks from the Makefile in commit 18f4217.