fix: remove stale e2e section from README

[raballew]

Summary

• Remove reference to non-existent action.yml composite action
• Remove stale bats/macOS reference (tests use Go/Ginkgo now)
• Replace redundant shell block with pointer to Makefile targets

Test plan

• Verify README renders correctly on GitHub

🤖 Generated with Claude Code

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 51654065-215e-4440-acd3-e8d275c349aa

📥 Commits

Reviewing files that changed from the base of the PR and between 536ef4a and fa04177.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

The README.md documentation is simplified by condensing the End-to-End Tests section. The rewrite removes specific script and CI action references and command examples, replacing them with a concise description and guidance to consult the Makefile for available E2E targets.

Changes

E2E Testing Documentation

Layer / File(s)	Summary
E2E Testing Section Documentation README.md	The "End-to-End Tests (e2e/)" section is condensed: removed references to setup-e2e.sh, run-e2e.sh, action.yml, and detailed local run instructions; replaced with brief text pointing readers to the Makefile for available targets.

Estimated Code Review Effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A simpler guide now greets the eyes,
Less scripts to mention, more streamlined and wise,
To the Makefile we point the weary soul,
Where all E2E targets play their role! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: removing outdated e2e documentation from README, which aligns with the primary objective and file changes.
Description check	✅ Passed	The description is directly related to the changeset, providing specific details about removing stale references, outdated tooling, and replacing with Makefile pointers.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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