fix(ollama): preserve tools across agent turns

[iwasatapex]

Description

Fix Ollama tool handling in Continue Agent mode.

The Ollama adapter previously attached tool definitions only when the last message had role user. After a tool call, the next request has a tool message as the latest message, so Continue stopped sending the tool definitions back to Ollama.

This caused multi-step agent loops to fall back to textual/XML tool calls instead of structured tool calls.

This change removes that incorrect restriction so tools remain available across agent turns.

What changed

• Always attach configured tools to Ollama chat requests.
• Added regression tests covering:
  • first-turn tool attachment
  • continuation after a tool result
  • multiple tool calls in the same agent loop

Testing

The added Ollama regression tests were run successfully against the patched source.

The fix was also packaged and tested with Continue 2.0.0 in a local VSCodium installation.

Scope

Only the Ollama tool-calling path and its regression tests are changed.

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[iwasatapex]

I have read the CLA Document and I hereby sign the CLA