fix: refresh PyPI version references

[kantorcodes]

Summary

• cache-bust the PyPI version badge so GitHub fetches the current Shields response
• update stale 1.2.0 README/action release examples to 1.4.0
• align the submission helper test fixture with the current scanner release version

Verification

• gh api https://pypi.org/pypi/codex-plugin-scanner/json --jq .info.version -> 1.4.0
• gh api https://img.shields.io/pypi/v/codex-plugin-scanner.svg?logo=pypi&logoColor=white&cacheSeconds=300 returns an SVG with aria-label="pypi: v1.4.0"
• /Users/michaelkantor/CascadeProjects/codex-plugin-scanner/.venv/bin/python -c import sys, pytest; sys.path.insert(0, "src"); raise SystemExit(pytest.main(["tests/test_submission.py", "-q"]))

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Overview

Simple version reference update from 1.2.0 → 1.4.0 across docs and test, plus cache-busting query params on the PyPI badge URL.

Severity	Count
CRITICAL	0
WARNING	0
SUGGESTION	0

Files Reviewed (3 files)

• README.md - Badge URL cache-busting + version text update
• action/README.md - Version text update
• tests/test_submission.py - Hardcoded version string updated

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_{Reviewed by mimo-v2-pro-20260318 · 126,900 tokens}

[gemini-code-assist]

Code Review

This pull request updates the documentation and test suite to reflect a version bump from 1.2.0 to 1.4.0. Specifically, it updates example release tags in the README files and adjusts the scanner version in a test case. Additionally, the PyPI badge in the main README was updated to use an SVG format with a cache duration. I have no feedback to provide as there were no review comments.