build: drop dead tomli fallback (closes #330)

[robotrocketscience]

Summary

Closes #330 option A. pyproject.toml declares requires-python = ">=3.12", so the tomli fallback in src/aelfrice/deferred_feedback.py:46-49 is unreachable (stdlib tomllib ships in 3.11+). Drop the try/except and the matching DEP003 deptry ignore.

Why a third PR

Prior #332 and #337 had byte-identical diffs but the auto-rebase workflow rewrote both as github-actions[bot] (no signing key), and the branch ruleset requires signed commits. Result: neither was mergeable. This PR re-applies the same change as a freshly signed commit so it can land. Filing the auto-rebase signing strip as a separate ruleset/CI bug.

Verification

• uv run python -c "from aelfrice import deferred_feedback" → import ok.
• uvx deptry src → "Success! No dependency issues found."
• Discretion grep clean.

Closes #330. Supersedes #332 and #337.

Summary by Sourcery

Remove the obsolete tomli fallback now that the project requires Python 3.12+ and relies solely on the standard-library tomllib.

Enhancements:

• Simplify deferred feedback configuration by dropping dead code related to tomli fallback.

Build:

• Clean up deptry configuration by removing the unused DEP003 ignore entry for tomli.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Removes the now-unreachable tomli fallback in favor of always using the standard-library tomllib, and drops the corresponding deptry ignore configuration, aligning the project with its Python >=3.12 requirement.

File-Level Changes

Change	Details	Files
Simplify deferred feedback TOML loading to rely solely on stdlib tomllib and remove the legacy third-party tomli fallback.	Remove the try/except import block that conditionally imported tomllib and fell back to tomli on ImportError. Clean up any remaining references or type hints related to the optional tomli dependency in the deferred feedback module.	src/aelfrice/deferred_feedback.py
Update deptry configuration to stop ignoring the deprecated tomli dependency now that it is no longer referenced anywhere.	Delete the DEP003 deptry ignore entry that documented tomli as a Python 3.10 fallback for tomllib. Keep all other deptry configuration entries unchanged.	pyproject.toml

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#330	Ensure the toml-loading code either (A) removes the third-party tomli fallback and uses only stdlib tomllib (dropping Python <3.11), or (B) declares tomli as a conditional runtime dependency for Python <3.11.	✅
#330	Remove the DEP003 tomli entry from [tool.deptry.per_rule_ignores] in pyproject.toml.	✅
#330	Keep the project working (tests/imports) on all declared supported Python versions after the change.	✅

Possibly linked issues

• build: replace tomli fallback with stdlib tomllib (drop Py 3.10) or declare tomli #330: PR implements issue’s option A: removes tomli fallback and the DEP003 deptry ignore, matching raised Python requirement.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

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Run ID: c53bb590-284f-4a17-b95d-724e189dff95

📥 Commits

Reviewing files that changed from the base of the PR and between aba8bed and 1613633.

📒 Files selected for processing (2)

• pyproject.toml
• src/aelfrice/deferred_feedback.py

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[robotrocketscience]

[claim:review:Setr:2026-05-01T16:06:44Z]

[robotrocketscience]

[release:review:Setr:2026-05-01T16:08:01Z]