refactor: remove unmaintained breakeven extension

[ParticularlyPythonicBS]

The breakeven extension was unmaintained and considered legacy.
Its removal helps clean up the codebase and reduce maintenance overhead.

Summary by CodeRabbit

• Removals
  • Removed the breakeven analysis extension and all associated functionality.
  • Cleared the extension’s README disclaimer and maintenance date (documentation content removed).

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: fc1aee86-be1a-44c6-a7db-60e971189fa9

📥 Commits

Reviewing files that changed from the base of the PR and between 40a9ea3 and 1a3a530.

📒 Files selected for processing (2)

• temoa/extensions/breakeven/README.txt
• temoa/extensions/breakeven/breakeven.py

💤 Files with no reviewable changes (2)

• temoa/extensions/breakeven/breakeven.py
• temoa/extensions/breakeven/README.txt

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Walkthrough

The breakeven analysis extension was removed: temoa/extensions/breakeven/README.txt contents deleted and the entire temoa/extensions/breakeven/breakeven.py module (≈1124 lines) deleted, eliminating the breakeven analysis and related utilities.

Changes

Cohort / File(s)	Summary
Breakeven Extension Removal temoa/extensions/breakeven/README.txt, temoa/extensions/breakeven/breakeven.py	Removed README content and deleted the full breakeven module (~1124 lines). Deleted functionality includes model construction helpers, coefficient extraction/computation, validation, sensitivity analyses (Pyomo and CPLEX API flows), search routines (binary/brute-force/CPLEX), plotting/export (Excel/console), and the module's script entry point.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'refactor: remove unmaintained breakeven extension' accurately summarizes the main change - the removal of the breakeven extension module due to it being unmaintained.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

• 📝 Generate docstrings (stacked PR)
• 📝 Generate docstrings (commit on current branch)

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch ref/removing_breakeven

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