feat: get the latest github release tag for codex

[kemingy]

Priority:

• use the user specified version
• use the latest tag
• fallback to the default one

[Copilot]

Pull request overview

This PR adds functionality to automatically fetch the latest Codex release version from GitHub when no explicit version is specified by the user. The implementation follows a priority system: user-specified version → latest GitHub release → default fallback version.

Changes:

• Added getLatestVersion function to fetch the latest release tag from GitHub API
• Updated version resolution logic in installAgentCodex to attempt fetching the latest version when user doesn't specify one
• Updated default Codex version from "0.92.0" to "0.98.0"

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 7 comments.

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

Comments suppressed due to low confidence (2)

envd/api/v1/install.py:98

• Changing the signature default from a pinned version to None no longer reflects the implementation: the Go backend still uses a pinned default (golangDefaultVersion) when no version is specified. Either restore the default argument to the pinned version, or update the docstring to explicitly state what version will be installed when version is omitted.

def go(version: Optional[str] = None):
    """Install Go programming language.

    Args:
        version (Optional[str]): Go version, such as '1.25.3'.

envd/api/v1/install.py:106

• Same issue as go(): the backend uses a pinned default (nodejsDefaultVersion) when version is not provided, but the signature now suggests there is no default. Please align the signature/docstring with the actual defaulting behavior to avoid misleading generated docs and users.

def nodejs(version: Optional[str] = None):
    """Install NodeJS programming language.

    Args:
        version (Optional[str]): NodeJS version, such as '25.1.0'.

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