Context improvements

[bebiksior]

This PR mostly focuses on improvements around context management.

• optimized context for prompt caching
• cursor-like tool calls truncation to reduce token usage
• The agent can now mark which todo it's working on
• We are no longer attaching full skill content to the context by default. This can be configured per skill via the new attachMode field. An agent can read skill content via the ReadSkill tool
• We are no longer dumping environment + learning data to the context by default. The agent will use LearningsRead and EnvironmentRead tools instead.
• Context usage tracking (first step towards long-running Shift agent)
• performance fix: unnecessary tab indicator draw calls were leading to bad performance during streaming

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​vitejs/​plugin-vue@​5.2.1 ⏵ 6.0.1	+2

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