fix(nx-plugin): deep merge executor options

[hanna-skryl]

Closes #753

This PR implements deep merge for executor options, allowing CLI arguments to augment rather than override nested configurations.

[github-actions]

Code PushUp

🤨 Code PushUp report has both improvements and regressions – compared target commit 6c53b5b with source commit e68ce12.

🕵️ See full comparison in Code PushUp portal 🔍

🏷️ Categories

🏷️ Category	⭐ Previous score	⭐ Current score	🔄 Score change
Performance	🔴 48	🔴 49
Documentation	🔴 23	🔴 23
Code coverage	🟢 91	🟢 91
Security	🟡 79	🟡 79	–
Updates	🟡 77	🟡 77	–
Accessibility	🟢 92	🟢 92	–
Best Practices	🟢 100	🟢 100	–
SEO	🟡 61	🟡 61	–
Bug prevention	🟢 100	🟢 100	–
Code style	🟢 100	🟢 100	–

👍 2 groups improved, 👎 1 group regressed, 👍 4 audits improved, 👎 5 audits regressed, 11 audits changed without impacting score

🗃️ Groups

🔌 Plugin	🗃️ Group	⭐ Previous score	⭐ Current score	🔄 Score change
Lighthouse	Performance	🔴 48	🔴 49
JSDoc coverage	Documentation coverage	🔴 23	🔴 23
Code coverage	Code coverage metrics	🟢 91	🟢 91

15 other groups are unchanged.

🛡️ Audits

🔌 Plugin	🛡️ Audit	📏 Previous value	📏 Current value	🔄 Value change
Lighthouse	Speed Index	🟥 6.2 s	🟥 6.5 s
Lighthouse	Largest Contentful Paint	🟨 3.8 s	🟨 3.7 s
Lighthouse	First Contentful Paint	🟨 2.9 s	🟨 2.9 s
Lighthouse	Time to Interactive	🟥 14.9 s	🟥 16.0 s
Lighthouse	Total Blocking Time	🟥 4,210 ms	🟥 6,230 ms
JSDoc coverage	Functions coverage	🟥 437 undocumented functions	🟥 437 undocumented functions
Code coverage	Branch coverage	🟨 86.1 %	🟨 86 %
Code coverage	Line coverage	🟩 90.1 %	🟩 90.1 %
Code coverage	Function coverage	🟩 93.1 %	🟩 93.1 %
Lighthouse	Avoids enormous network payloads	🟩 Total size was 1,818 KiB	🟩 Total size was 1,822 KiB
Lighthouse	Minimizes main-thread work	🟥 15.0 s	🟥 18.5 s
Lighthouse	Metrics	🟩 100%	🟩 100%
Lighthouse	JavaScript execution time	🟥 8.1 s	🟥 8.9 s
Lighthouse	Max Potential First Input Delay	🟥 2,220 ms	🟥 2,450 ms
Lighthouse	Eliminate render-blocking resources	🟥 Potential savings of 850 ms	🟥 Potential savings of 630 ms
Lighthouse	Uses efficient cache policy on static assets	🟨 27 resources found	🟨 27 resources found
Lighthouse	Reduce unused CSS	🟥 Potential savings of 67 KiB	🟥 Potential savings of 46 KiB
Lighthouse	Server Backend Latencies	🟩 180 ms	🟩 330 ms
Lighthouse	Initial server response time was short	🟩 Root document took 550 ms	🟩 Root document took 560 ms
Lighthouse	Network Round Trip Times	🟩 70 ms	🟩 70 ms

576 other audits are unchanged.

[matejchalk]

Nicely done 👍