Refactor GitHub MCP transport options to share a single common option struct

[Copilot]

GitHubMCPDockerOptions and GitHubMCPRemoteOptions had re-diverged, each redeclaring the same 8 shared fields. This change consolidates those fields into one embedded GitHubMCPCommonOptions to keep shared MCP behavior aligned across transport modes.

• Shared option model

  • Added GitHubMCPCommonOptions with:
    • ReadOnly, Lockdown, LockdownFromStep, GuardPoliciesFromStep
    • Toolsets, Features, AllowedTools, GuardPolicies
  • Updated GitHubMCPDockerOptions and GitHubMCPRemoteOptions to embed the common struct.

• Renderer construction updates

  • Updated GitHub MCP option construction in mcp_renderer_github.go to initialize shared fields via GitHubMCPCommonOptions, leaving transport-specific fields in the transport structs.

• Test alignment + regression guard

  • Updated existing Docker/Remote config tests to use embedded common options in keyed literals.
  • Added a focused type-level regression test asserting both transport option structs embed GitHubMCPCommonOptions.

type GitHubMCPCommonOptions struct {
    ReadOnly              bool
    Lockdown              bool
    LockdownFromStep      bool
    GuardPoliciesFromStep bool
    Toolsets              string
    Features              string
    AllowedTools          []string
    GuardPolicies         map[string]any
}

type GitHubMCPDockerOptions struct {
    GitHubMCPCommonOptions
    DockerImageVersion string
    CustomArgs         []string
    IncludeTypeField   bool
    EffectiveToken     string
}

• Fixes [deep-report] Re-file: GitHubMCPDockerOptions/GitHubMCPRemoteOptions still duplicate 8 shared fields (prior fix #51076 didn't stick) #54227

[github-actions]

PR Triage

• Category: refactor
• Risk: low
• Priority score: 30/100 (impact 10, urgency 5, quality 15)
• Recommended action: defer
• CI status: no_checks

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[github-actions]

PR Triage

Category: refactor | Risk: low | Priority: low | Score: 28/100
Recommended action: defer

Draft. Consolidates GitHub MCP transport option structs.

_{Automated triage — run 32572524009}

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