fix(agent): changed embedding of vcc dlls in artefacts (#165)

[impolitepanda]

Proposed changes

• Moved rustflag building (including the +crt-static flag) from the github action to the cargo config so that any compile command will use it and embed the required libraries

Testing Instructions

1. Build agent on a windows Arm64 machine
2. Execute it on a windows Arm64 machine that doesn't have the VCC preinstalled

Related issues

• Closes fix: agent not starting on Windows arm64 (missing VC140RUNTIME.dll) #165

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality
• For bug fix -> I implemented a test that covers the bug

[Copilot]

Pull request overview

This PR aims to fix Windows ARM64 agent startup failures caused by a missing VC runtime DLL by enforcing static CRT linkage via Cargo configuration (rather than CI-only flags), and adds a CI verification step to ensure the produced Windows binaries do not dynamically import VCRUNTIME.

Changes:

• Move +crt-static from CI RUSTFLAGS into .cargo/config.toml target-specific rustflags for Windows MSVC targets.
• Remove CI RUSTFLAGS setup to avoid overriding Cargo target-specific rustflags.
• Add a Windows CI step that checks the built executable for dynamic VCRUNTIME dependencies.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
.github/workflows/agent-ci.yml	Removes CI RUSTFLAGS usage and adds a dependency check step for Windows builds.
.cargo/config.toml	Adds Windows MSVC target rustflags to force static CRT linkage and attempts to centralize symbol stripping.

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