chore: split heavy ML stack into optional mmory extras

[AaineeSinha]

Closes #35

This PR separates the heavy machine learning packages (chromadb, sentence-transformers, torch) out of the main requirements.txt file and moves them into a new requirements-memory.txt file.

This ensures that the core CLI installation remains lightweight and fast for new users and CI environments while preserving an explicit installation path for future vector memory features.

[rosspeili]

Thanks for this as well @AaineeSinha.

Before merge, could you fix a couple small README things in the same PR?

• Close the optional pip install -r requirements-memory.txt code block before ### 2. Configure defaults (looks like the fence is missing right now).
• Tidy the project structure line for requirements-memory.txt (duplicate comment on one line).
• Optional: link to feat: long-term agent memory across sessions (sidecar storage) #13 where you mention long-term / vector memory.

CI should be fine as-is since it only installs requirements.txt. Thanks again!

[AaineeSinha]

Hi @rosspeili, I have updated the README.md to resolve the layout and reference issues. The code block closing fence has been fixed, the trailing text typo in the project structure tree has been removed, and a reference to issue #13 has been added to the long-term memory section. Ready for another look when you have a moment!

[rosspeili]

Thanks for the update @AaineeSinha, project structure and the #13 mention look good.

The optional install code block still needs a closing ``` after pip install -r requirements-memory.txt (before ### 2. Configure defaults). Right now that heading is inside the bash fence on GitHub.

Once that’s in, good to merge from my side. Thanks again!

[AaineeSinha]

Hi @rosspeili, I've closed the code block fence right after the optional memory install step so the ### 2. Configure defaults (optional) heading renders correctly now.

[rosspeili]

Confirmed, the code fence is fixed and Quick Start renders properly now. Core vs memory split looks good, also, merging after CI is green. Thanks again!