fix: clear generated code after composer require

[dgjlindsay]

Summary

• Clear stale generated code after composer require during make install
• The base Docker image ships pre-compiled DI classes that conflict with the plugin's classes after composer install, causing DI compilation errors

Test plan

• make install completes without DI compilation errors
• make test passes

🤖 Generated with Claude Code

[gemini-code-assist]

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[claude]

No critical issues. The fix correctly clears stale pre-compiled DI classes from the base Docker image before setup:di:compile runs, which is the standard Magento approach for this problem. Ready for human approval.

[claude]

Brand values are interpolated directly into the URL without encoding. The PHP side correctly uses http_build_query(), but if these env vars ever contain spaces or special chars the URL here will be malformed. Use encodeURIComponent for consistency.

Suggested change

	var brandParams = config.brand ? `&brand=${config.brand}` : '';
	if (config.brandVersion) {
	brandParams += `&brandVersion=${config.brandVersion}`;
	}
	const URL = `${config.checkoutPageUrl}/soletrader/signup?businessToken=${this.delegationToken}&autofillToken=${this.autofillToken}&autofillData=${data}${brandParams}`;
	var brandParams = config.brand ? '&brand=' + encodeURIComponent(config.brand) : '';
	if (config.brandVersion) {
	brandParams += '&brandVersion=' + encodeURIComponent(config.brandVersion);
	}
	const URL = `${config.checkoutPageUrl}/soletrader/signup?businessToken=${this.delegationToken}&autofillToken=${this.autofillToken}&autofillData=${data}${brandParams}`;

[claude]

Re-reviewing after new commits. One minor correctness issue flagged inline (missing encodeURIComponent in JS brand params). The core fix (rm -rf /data/generated/code) and the PHP brand param logic are correct. Ready for human approval once the encoding is addressed.