chore: add PHPStan static analysis

[superdav42]

Summary

• add PHPStan with WordPress and WooCommerce type information
• establish a clean level 3 static-analysis baseline without generated suppressions
• run PHPStan alongside PHPCS in the code-quality workflow
• fix callback declarations, PHPDoc types, and small defects exposed by static analysis

Context

This follows merged PR #59. The PHPStan work was completed after that PR merged, so it is delivered separately here.

Implementation

• Analyze includes/ and the plugin entry points using szepeviktor/phpstan-wordpress.
• Provide a small scan-only stub for functions supplied by the optional Akismet plugin.
• Add composer phpstan and include PHPStan in composer lint.
• Keep PHPCS and PHPStan in one CI job to reuse the Composer installation.

Verification

• composer validate --strict
• composer lint (PHPCS: 0 errors; PHPStan level 3: 0 errors)
• npm run lint (0 errors; existing warnings reported)
• npm run build
• git diff --check origin/master..HEAD

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aidevops.sh v3.34.13 plugin for OpenCode v1.18.31 with gpt-5.6-sol

[superdav42]

Summary

• add PHPStan with WordPress and WooCommerce type information
• establish a clean level 3 static-analysis baseline without generated suppressions
• run PHPStan alongside PHPCS in the code-quality workflow
• fix callback declarations, PHPDoc types, and small defects exposed by static analysis

Context

This follows merged PR #59. The PHPStan work was completed after that PR merged, so it is delivered separately here.

Implementation

• Analyze includes/ and the plugin entry points using szepeviktor/phpstan-wordpress.
• Provide a small scan-only stub for functions supplied by the optional Akismet plugin.
• Add composer phpstan and include PHPStan in composer lint.
• Keep PHPCS and PHPStan in one CI job to reuse the Composer installation.

Verification

• composer validate --strict
• composer lint (PHPCS: 0 errors; PHPStan level 3: 0 errors)
• npm run lint (0 errors; existing warnings reported)
• npm run build
• git diff --check origin/master..HEAD

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aidevops.sh v3.34.13 plugin for OpenCode v1.18.31 with gpt-5.6-sol

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Merged via PR #63 to master.
Merged by deterministic merge pass (pulse-wrapper.sh).