t137: Bump plugin version to 1.3.0 and update CHANGELOG.md

[superdav42]

Summary

Bumps the plugin version from 1.2.0 to 1.3.0 and populates the CHANGELOG.md [1.3.0] section with all changes merged since v1.2.0 (2026-03-19).

Changes

• gratis-ai-agent.php — Version: header updated to 1.3.0
• readme.txt — Stable tag: updated to 1.3.0
• CHANGELOG.md — New [1.3.0] - 2026-03-24 section added with:
  • 10 Added entries: new AI models (Gemini 2.5 Flash, o3, o4-mini, claude-sonnet-4-6, claude-opus-4-6, Claude 3.5 Haiku, Gemini 2.0 Flash), JS bundle size budget CI gate, Playwright E2E tests for shared conversations / agent builder / automations / Changes admin page, WP.org SVN submission guide, PHPStan level 10
  • 20 Fixed entries: security hardening, GPL license headers, readme.txt PHP requirement, PHPCS annotations, pre-commit hook fallback, type safety guards in GitAbilities/SiteScanner/AutomationRunner, model ID prefix fix, schema alignment fixes, export filename fix, abilities manager filter UX, ShellCheck violations, PHPStan levels 8 and 9, E2E test coverage gaps
  • 1 Changed entry: composer package rename to ultimate-multisite/ai-agent
  • Comparison link [1.3.0] added at bottom of file

Closes #646

Summary by CodeRabbit

• New Features

  • Expanded model selector with multiple new model options
  • New automated test suites covering conversations, agent builder, and automations

• Improvements

  • Enhanced security and code quality measures
  • Improved PHP code standards compliance
  • Added comprehensive WP.org deployment documentation

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: a17b94c8-9166-4bd0-b914-d1f0bd5cb329

📥 Commits

Reviewing files that changed from the base of the PR and between 9cb2c27 and 8a71465.

📒 Files selected for processing (3)

• CHANGELOG.md
• gratis-ai-agent.php
• readme.txt

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📝 Walkthrough

Walkthrough

This is a version release update bumping the plugin from v1.2.0 to v1.3.0 across manifest files and CHANGELOG.md. The changelog documents 53 merged commits including new model additions, PHPStan level 10 enforcement, E2E test coverage expansion, and various bug fixes and security hardening improvements.

Changes

Cohort / File(s)	Summary
Version & Release Metadata gratis-ai-agent.php, readme.txt	Plugin version header and stable tag bumped from 1.2.0 to 1.3.0.
Changelog Documentation CHANGELOG.md	New v1.3.0 release section (dated 2026-03-24) added with Added, Fixed, and Changed subsections documenting model selector expansions, Playwright E2E test suites, PHPStan level 10 enforcement, schema/runtime fixes, security hardening, and a Composer package rename.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 Hops with glee ✨
From one-point-two to one-point-three,
The versions march through changelog's tree!
New models dance and fixes gleam,
A brighter release fulfills the dream! 🚀

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately and directly reflects the PR's main objective: bumping the plugin version and updating the changelog.
Linked Issues check	✅ Passed	All coding requirements from issue #646 are met: CHANGELOG.md [1.3.0] section added with all changes, plugin Version bumped to 1.3.0 in gratis-ai-agent.php, and Stable tag updated to 1.3.0 in readme.txt.
Out of Scope Changes check	✅ Passed	All changes are directly scoped to the version bump and changelog documentation; no unrelated modifications are present.
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

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/version-bump-1.3.0

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