[AAASM-3549] 🐛 (docs): Restore mkdocs search plugin

[Chisanan232]

Description

The MkDocs site lost its search bar because mkdocs.yml's explicit plugins: list omitted the built-in search plugin. Declaring any plugin disables MkDocs' implicit defaults, so with only mkdocstrings and mike listed, search was no longer loaded and no search index was emitted.

This PR adds - search as the first entry under plugins:, restoring the search bar and the generated search index. Only that one entry changed — nothing else in mkdocs.yml was touched.

Type of Change

• ✨ New feature
• 🔧 Bug fix
• ♻️ Refactoring
• 🍀 Performance improvement
• 📚 Documentation update
• 🚀 Release

Breaking Changes

• No
• Yes (please describe below)

Related Issues

• Related JIRA ticket: AAASM-3549
• Related GitHub issues: #XX

Testing

Describe the testing performed for this PR:

• Unit tests added/updated
• Integration tests added/updated
• Manual testing performed
• No tests required (explain why)

uv run --group docs mkdocs build --strict builds cleanly (the only non-fatal note is the pre-existing release/RUNBOOK.md not-in-nav INFO). The search index is regenerated at site/search/search_index.json (~270 KB), confirming the search plugin is loaded again.

Checklist

• Code follows project style guidelines
• Self-review completed
• Comments added for complex logic
• Documentation updated if needed
• All tests passing

[Chisanan232]

Claude Code — review result

✅ CI green — Analyze (python), CodeQL, and Build documentation (PR, no deploy) all pass (deploy steps skip on PR, as expected). No SonarCloud/coverage failures.

Scope vs AAASM-3549 — fully covered. The Python SDK docs had lost their search bar because mkdocs.yml's explicit plugins: list omitted the default search plugin (mkdocs disables implicit defaults once plugins: is declared). This PR adds - search as the first plugin entry — a one-line, single-concern fix; nothing else touched. Verified mkdocs build --strict is clean and site/search/search_index.json is regenerated (only emitted when the search plugin loads), so the search bar is restored.

Ready for approval + merge. Minimal, correct fix matching the ticket exactly.