Update Changelog

Updates CHANGELOG.md under the ## Unreleased section following project conventions.

When to Use

• After implementing a new feature
• After fixing a bug
• After any user-facing change (docs, config, behavior)

Decision Flow

1. Is this a minor change to an existing feature already mentioned in Unreleased?

   • Yes → Update that existing bullet; do not add a new one
   • No → Add a new bullet under Unreleased

2. Is this purely internal/refactor with no user impact?

   • Yes → Changelog update optional; add only if it clarifies a release
   • No → Always update

Format Rules

• Style: Present tense, sentence case
• Structure: One bullet per logical change; multi-line bullets use 2-space indent for continuation
• Placement: New entries go at the top of the Unreleased list (after the ## Unreleased heading)
• Commands/APIs: Use backticks for names (e.g. makevectordatabase, run_doc_examples)
• Links: Use [text](path) for doc references when helpful

Examples

New feature (add new bullet):

- Added **mySegment** for filtering items by score threshold.

Minor change to existing feature (update existing bullet): If Unreleased already has:

- Doc examples tests clean up artifacts (e.g. `my_knowledge_base` from RAG examples) after each test.

And you add validation for path traversal, update it:

- Doc examples tests clean up artifacts (e.g. `my_knowledge_base` from RAG examples) after each test.
  Cleanup validates paths before deletion to prevent path traversal.

Bug fix:

- Fixed chatterlang_serve stream interface so search results display reliably.

Multiple related changes (one bullet):

- RAG source citation: ProcessDocumentsSegment preserves title and source (path) as separate
  metadata fields; construct_background prioritizes them in prompts; default system prompt and
  prompt_directive instruct the LLM to cite sources.

Checklist

• Check Unreleased for an existing entry that covers this change
• Update that entry if found; otherwise add a new bullet
• Use present tense
• Place new bullets at the top of the Unreleased list