Refactor MCP server update tool to call Go function directly

[Copilot]

The MCP server's update tool was spawning gh-aw as a subprocess for each invocation. This refactoring replaces subprocess execution with direct function calls.

Changes

• New context-aware API: Added UpdateWorkflowsWithExtensionCheckContext(ctx context.Context, output io.Writer, ...) that:

  • Respects context cancellation at each major step
  • Captures output to provided io.Writer instead of os.Stderr
  • Returns captured output string alongside error for MCP responses

• WithWriter helper functions: Created output-parameterized versions of internal helpers:

  • checkExtensionUpdateWithWriter
  • UpdateActionsWithWriter
  • UpdateWorkflowsWithWriter
  • RunFixWithWriter / runFixCommandWithWriter
  • createUpdatePRWithWriter
  • showUpdateSummaryWithWriter
  • processWorkflowFileWithInfo(w io.Writer, ...)

• MCP server integration: Updated mcp_server.go update tool handler to call UpdateWorkflowsWithExtensionCheckContext directly with bytes.Buffer for output capture

• Backward compatibility: Existing public functions unchanged, delegate to new WithWriter versions using os.Stderr

Example

Before:

// MCP server spawned subprocess
cmd := execCmd(ctx, "update", "--major", "--force")
output, err := cmd.CombinedOutput()

After:

// Direct function call with context and output capture
var buf bytes.Buffer
outputStr, err := UpdateWorkflowsWithExtensionCheckContext(
    ctx, &buf, workflowNames, allowMajor, force, ...)

No global state introduced. All state passed through parameters for thread-safe concurrent usage.

Original prompt

Refactor the MCP-server command implementation of the "update" tool to call the Go function command directly instead of executing the gh-aw binary.

Do not add global state, pass context as variable if needed. Assume concurrent usage.

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