Clarify user confirmation requirement in issue and pull request creation messages

[mattdholloway]

Summary

This pull request updates user-facing confirmation messages in the interactive issue and pull request creation/update workflows. The changes clarify that no action has been taken yet and that explicit user confirmation is required before proceeding.

Why

Fixes #

What changed

User-facing messaging improvements:

• In pkg/github/issues.go, updated the messages shown when preparing to create or update an issue to clearly state that the issue has NOT been created or updated yet, and that the user MUST confirm the operation.
• In pkg/github/pullrequests.go, updated the message shown when preparing to create a pull request to clarify that the PR has NOT been created yet and requires explicit user confirmation.

MCP impact

• No tool or API changes
• Tool schema or behavior changed
• New tool added

Prompts tested (tool changes only)

Security / limits

• No security or limits impact
• Auth / permissions considered
• Data exposure, filtering, or token/size limits considered

Tool renaming

• I am renaming tools as part of this PR (e.g. a part of a consolidation effort)
  • I have added the new tool aliases in deprecated_tool_aliases.go
• I am not renaming tools as part of this PR

Note: if you're renaming tools, you must add the tool aliases. For more information on how to do so, please refer to the official docs.

Lint & tests

• Linted locally with ./script/lint
• Tested locally with ./script/test

Docs

• Not needed
• Updated (README / docs / examples)

[Copilot]

Pull request overview

This PR improves the clarity of user confirmation messages for issue and pull request operations in insiders mode with UI support. The changes make it explicit to AI agents that operations requiring user confirmation have NOT been completed yet, helping prevent misunderstandings about the state of these operations.

Changes:

• Enhanced confirmation messages for create_pull_request, create_issue, and update_issue operations to explicitly state the operation has not been completed and requires user confirmation

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
pkg/github/pullrequests.go	Updated create_pull_request UI confirmation message to clarify operation is pending user confirmation
pkg/github/issues.go	Updated create_issue and update_issue UI confirmation messages to clarify operations are pending user confirmation