Add Agent Playbook section to README

[stefanvacareanu7]

Summary

• Adds an "Agent Playbook: Updating This Repository End-to-End" section to README.md documenting how an automated agent should perform version bumps for this Codacy Prospector engine (requirements.txt pins, docs/patterns.json / docs/description hand-maintenance, Dockerfile base image, CircleCI job flow, and local/CI test verification steps).
• Documentation only — no functional changes.

Test plan

• N/A (README-only change). CI should still pass unchanged since no functional files were modified.

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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[codacy-production]

Pull Request Overview

The PR successfully introduces the 'Agent Playbook' section to the README, aligning with the requirement to document the end-to-end update process. Codacy analysis indicates the changes are up to standards. However, the documentation contains a technical error in the Docker unit testing command which would likely fail during execution because it does not account for the container's entrypoint or internal pathing. This issue should be resolved to ensure the playbook provides accurate instructions for local verification.

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[codacy-production]

_{🟡 MEDIUM RISK}

The command to run unit tests is likely missing the python interpreter and the correct absolute path. If the image uses an ENTRYPOINT for the linter, this command will attempt to lint the test file instead of executing it. Try running the following prompt in your coding agent: > Check the Dockerfile to determine the ENTRYPOINT and WORKDIR. Update the unit test execution commands in README.md (at line 56 and line 76) to use the correct syntax, ensuring they invoke the python interpreter with the correct absolute path to codacy_prospector_test.py inside the container.