Feat/context management

[olimorris]

Description

This PR will add the ability for CodeCompanion to manage context when it approaches a token value or context window percentage. This should prevent chats from becoming unusable or context rot setting in.

TBU.

Summary of changes

• Anthropic: The adapter has been overhauled to include much larger max_tokens parameters as well as conform to various changes that Anthropic brought in with the 4.6 models. Compaction has also been enabled.
• OpenAI Responses: The adapter now fully supports compaction via their native server-side process.

AI Usage

Opus 4.6 to double check my implementation against documentation.

Related Issue(s)

Screenshots

Checklist

• I've read the contributing guidelines and have adhered to them in this PR
• I confirm that this PR has been majority created by me, and not AI (unless stated in the "AI Usage" section above)
• I've run make all to ensure docs are generated, tests pass and StyLua has formatted the code
• (optional) I've added test coverage for this fix/feature
• (optional) I've updated the README and/or relevant docs pages

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