Prevent MCP compile bulk mode from hanging on large workflow sets

[Copilot]

Bulk agenticworkflows compile . could run indefinitely when invoked without workflows on repositories with many workflow markdown files. Targeted compiles were fast, so the failure mode was specific to unbounded bulk execution in the MCP compile path.

• Bulk compile timeout guard (MCP tool path)

  • Added a timeout for compile tool invocations when workflows is omitted (bulk mode).
  • Timeout is scoped to MCP subprocess execution; targeted workflows calls keep existing behavior.

• Structured failure output instead of protocol error

  • On timeout, the tool now returns normal compile JSON with a config_error entry and actionable guidance to compile in smaller batches via workflows.
  • Preserves MCP contract: callers still receive parseable compile results, not transport/protocol failure.

• Focused regression coverage

  • Added a unit test that forces bulk timeout and asserts structured JSON output, error type, and guidance text.

if len(args.Workflows) == 0 {
    execCtx, cancel = context.WithTimeout(ctx, mcpCompileBulkTimeout)
    defer cancel()
}

stdout, err := execCmd(execCtx, cmdArgs...).Output()

if len(args.Workflows) == 0 && errors.Is(execCtx.Err(), context.DeadlineExceeded) {
    // return JSON validation result with config_error + batching guidance
}