Replace magic time.Sleep literals in pkg/cli with named duration constants

[Copilot]

Several production paths in pkg/cli encoded pacing and startup/shutdown waits as inline time.Sleep literals. This change aligns those waits with the existing local named-constant pattern already used elsewhere in the CLI for retry and API cooldown behavior.

• Replace hardcoded CLI delays with local constants

  • Introduce file-local time.Duration constants for:
    • trial repository initialization delay
    • inter-workflow trigger pacing
    • MCP inspector stdio server startup and cleanup pacing
    • mcp-scripts server readiness polling
    • mcp-scripts shutdown grace period

• Keep delay policy scoped to each call site

  • Each delay remains defined next to the code it governs rather than being shared across unrelated flows.
  • The two MCP inspector delays are grouped in a single const block to keep related timing policy together.

• Make intent explicit at the call sites

  • Sleep calls now use named values that describe why the pause exists instead of repeating raw durations.

const betweenWorkflowsDelay = 1 * time.Second

if i < len(workflowNames)-1 {
	time.Sleep(betweenWorkflowsDelay)
}

[Copilot]

Pull request overview

This PR replaces several inline time.Sleep duration literals in pkg/cli with named time.Duration constants to make the intent of each delay explicit at the call site while keeping the timing policy near the code it governs.

Changes:

• Introduce named duration constants for repository initialization, workflow trigger pacing, and MCP inspector/server startup/shutdown waits.
• Replace hardcoded time.Sleep(<literal>) calls with the corresponding named constants across the affected CLI flows.

Show a summary per file

File	Description
pkg/cli/trial_repository.go	Adds trialRepoInitDelay constant and uses it for post-repo-create initialization wait.
pkg/cli/run_workflow_execution.go	Adds betweenWorkflowsDelay constant and uses it to pace sequential workflow triggers.
pkg/cli/mcp_inspect.go	Adds mcpScriptsServerShutdownDelay constant and uses it during mcp-scripts shutdown cleanup.
pkg/cli/mcp_inspect_mcp_scripts_server.go	Adds a named delay constant for readiness polling sleep while waiting for the server to come up.
pkg/cli/mcp_inspect_inspector.go	Adds grouped constants for stdio server startup wait and inter-process cleanup pacing, and uses them in the inspector flow.

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• Files reviewed: 5/5 changed files
• Comments generated: 2