Create v2 tag and update version to 2.0.0

[Copilot]

This PR creates the requested v2 tag for the ee-cli project and updates the version system to properly display version 2.0.0.

Changes Made

Version System Updates

• Updated the default VERSION in Makefile from 0.1.0 to 2.0.0
• Fixed a case mismatch bug in the build system where LDFLAGS was trying to set main.Version but the actual variable in main.go is main.version (lowercase)

Git Tags Created

• Created annotated tag v2.0.0 with message "Release 2.0.0"
• Created annotated tag v2 with message "Release v2" (as specifically requested)

Issue Fixed

The version injection during build was broken due to the case mismatch between the LDFLAGS (main.Version) and the actual Go variable (main.version). This caused the built binary to always show "dev" instead of the intended version number.

Verification

After the changes:

$ make build
$ ./build/ee --version
ee version 2.0.0

$ git tag
v2
v2.0.0

The version is now correctly injected at build time and both requested tags have been created successfully. All existing tests continue to pass.

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