Update ruby_llm gem as later versions now support Bedrock

[jamesspeake]

Noticed creating the local dev env was slow because we had pinned a git version of ruby_llm. So followed the advice of the comment in the code and changed it now that the releases support Bedrock as required.

Claude says: All releases are explicitly backward-compatible (1.16: "This release is backwards compatible"). The changes are additive or irrelevant to us:

• v1.15 token-accounting normalization — the one change with an upgrade note. Only matters "if you display or store token counts directly." We don't — grep for .tokens/*_tokens/.usage came back empty.
• Deprecated legacy on_* callbacks — we don't use any callbacks.
• RubyLLM.paint, with_tools choice/calls, .cost helpers, new config options (faraday_adapter, deprecation_behavior, *_api_base) — all additive, none used by us.

Changelog

Technical

• Update LLM gem

[jamesspeake]

There is a test failure as office document types are now supported by the LLM - need to understand what the desired behaviour should actually be for us. @adessy maybe we can discuss as I think you know most about this.

Root cause: xlsx is now a supported attachment type - ruby_llm's attachment classifier gained a new :document category between your old pin (~1.12) and 1.16:

Old pin (1.12-era):
def type
return :image if image?
return :video if video?
return :audio if audio?
return :pdf if pdf?
return :text if text?
:unknown # ← xlsx landed here → rejected with UnsupportedAttachmentError
end

1.16:
def type
return :image if image?
return :video if video?
return :audio if audio?
return :pdf if pdf?
return :text if text?
return :document if document? # ← NEW
:unknown
end

DOCUMENT_EXTENSIONS = %w[doc docx dot key numbers odp ods odt pages pot pps ppt pptx rtf xls xlsx].freeze

So david.xlsx now matches document? (via that extension list) and is classified as a :document instead of :unknown. ruby_llm no longer rejects it, so RubyLLM::UnsupportedAttachmentError is never raised — hence "nothing was raised."