[K9VULN-16251] Add agentic Bits AI docs

[colemaring]

What does this PR do? What is the motivation?

Adds a short agentic Bits AI assessments section to AI Enhanced Static Code Analysis.

Related release note PR
https://github.com/DataDog/web-ui/pull/319445

[github-actions]

Preview links (active after the build_preview check completes)

Modified Files

• https://docs-staging.datadoghq.com/cole.maring/agentic-bits-ai-assessments-docs/security/code_security/static_analysis/ai_enhanced_sast

[domalessi]

A few minor suggestions. Hit me up when ready for a final look!

[domalessi]

Suggested change

	This extra context helps Bits AI distinguish true positives from false positives for findings that depend on cross-file behavior. Agentic Bits AI Assessments apply to SAST findings only.
	The additional repository context helps Bits AI distinguish true positives from false positives for findings that depend on cross-file behavior. Agentic Bits AI Assessments apply to SAST findings only.

[domalessi]

Suggested change

	For supported SAST rules, Bits AI Assessments use an agentic approach to gather repository context before classifying findings. Bits AI can read related files and search for symbols and patterns. It can also inspect nearby directory structure to verify definitions, call paths, sanitizers, and framework wiring that are not visible in a single file.
	For supported SAST rules, Bits AI Assessments use an agentic approach to gather repository context before classifying findings. Bits AI can read related files and search for symbols and patterns. Bits AI can also inspect the surrounding directory structure to verify definitions, call paths, sanitizers, and framework wiring that are not visible in a single file.

[domalessi]

Capitalization of "assessments" is inconsistent. The heading (line 146) uses lowercase "assessments" (correct sentence case), but the body capitalizes it as "Assessments." If "Bits AI Assessments" is an official feature name, it should be capitalized throughout.