Resolve bare native ECA tool names

[zikajk]

Some LLM tool calls occasionally omit the eca__ prefix for native tools, such as write_file instead of eca__write_file.
This caused native tool dispatch to fail and could lead to repeated retries before the model recovered.`

Resolve bare native ECA tool names to their canonical form, keep MCP tool names strict, and log auto-resolved native tool calls for debugging.

• I added a entry in changelog under unreleased section.
• This is not an AI slop.

[zikajk]

@ericdallo This might be a bit controversial 😅 , but some models still try to call tools without a prefix first. For a while, I thought about extending this to MCP if the tool has a unique name and there's no risk of collision, but I ultimately decided to stick with native tools only. I haven't noticed any regressions during several hours of testing, so I believe this is a safe change (and also consistent with what we allow in the config).

[ericdallo]

@zikajk hum, what models you saw that?
Also CI tests are failing

[zikajk]

@ericdallo Deepseek 4 and local QWEN.

[ericdallo]

Ok, let's go ahead since this seems safe enough and see how it goes

[zikajk]

@ericdallo Tests are fixed, the error isn't related to changes here which is interesting as other pipelines were green.
Maybe it would be a good idea to use m/embed and make these tests less strict so they don't fail when the description changes or something like that. But let's leave that for another time :-)