Consolidate ask_user E2E snapshots into single canonical folder

[stephentoub]

Fixes #314

test/snapshots/ had three sibling folders for the same scenario (ask-user/, ask_user/, askuser/), which caused confusion and snapshot drift across SDKs. This PR consolidates them.

What's actually used

All five SDK E2E harnesses already resolve their snapshot path to ask_user/:

SDK	How the path is derived
Node.js	sdkTestContext.ts strips .test.ts / .e2e and replaces - with _, so ask_user.e2e.test.ts -> ask_user
Python	conftest.py strips test_ and _e2e, so test_ask_user_e2e.py -> ask_user
Go	testharness/context.go strips _test.go / _e2e, so ask_user_e2e_test.go -> ask_user
.NET	AskUserE2ETests.cs passes "ask_user" explicitly
Rust	tests/e2e/ask_user.rs passes "ask_user" explicitly

No harness has any fallback / alternative-spelling logic, and the replaying CAPI proxy uses the exact path the harness gives it. So ask-user/ and askuser/ were dead snapshots that only existed because earlier captures were regenerated under different folder names.

The change

Deletions only, no source/test/harness code changes:

• Removed test/snapshots/ask-user/ (3 should_*.yaml files)
• Removed test/snapshots/askuser/ (3 should_*.yaml files)
• Removed 3 stale files inside test/snapshots/ask_user/ left over from before PR Fail CI if snapshots aren't present #304 normalized test names to use the should_ prefix:
  • handle_freeform_user_input_response.yaml
  • invoke_user_input_handler_when_model_uses_ask_user_tool.yaml
  • receive_choices_in_user_input_request.yaml

Kept the 3 canonical ask_user/should_*.yaml files that every SDK's tests actually replay against.

Validation

All ask_user E2E suites pass in snapshot-replay mode (GITHUB_ACTIONS=true) against the consolidated folder: Node.js 3/3, Python 3/3, Go 3/3, .NET 3/3, Rust 3/3.

Scope

This is scoped to ask_user per #314. The remaining mcp_and_agents / mcp-and-agents sibling pair is tracked separately as the related issue #315 and is intentionally left alone here.

[Copilot]

Pull request overview

Consolidates duplicate ask_user E2E snapshot folders into the single canonical test/snapshots/ask_user/ directory that all five SDK harnesses actually resolve to, eliminating dead snapshots and snapshot drift.

Changes:

• Deletes the unused test/snapshots/ask-user/ folder (3 should_*.yaml files).
• Deletes the unused test/snapshots/askuser/ folder (3 should_*.yaml files).
• Removes 3 stale pre-should_-prefix files from test/snapshots/ask_user/, keeping only the canonical should_*.yaml snapshots.

Show a summary per file

File	Description
test/snapshots/ask-user/should_receive_choices_in_user_input_request.yaml	Removes unused duplicate snapshot.
test/snapshots/ask-user/should_invoke_user_input_handler_when_model_uses_ask_user_tool.yaml	Removes unused duplicate snapshot.
test/snapshots/ask-user/should_handle_freeform_user_input_response.yaml	Removes unused duplicate snapshot.
test/snapshots/askuser/should_receive_choices_in_user_input_request.yaml	Removes unused duplicate snapshot.
test/snapshots/askuser/should_invoke_user_input_handler_when_model_uses_ask_user_tool.yaml	Removes unused duplicate snapshot.
test/snapshots/askuser/should_handle_freeform_user_input_response.yaml	Removes unused duplicate snapshot.
test/snapshots/ask_user/receive_choices_in_user_input_request.yaml	Removes stale pre-should_-prefix snapshot.
test/snapshots/ask_user/invoke_user_input_handler_when_model_uses_ask_user_tool.yaml	Removes stale pre-should_-prefix snapshot.
test/snapshots/ask_user/handle_freeform_user_input_response.yaml	Removes stale pre-should_-prefix snapshot.

Copilot's findings

• Files reviewed: 9/9 changed files
• Comments generated: 0