Copilot E2E Fixes

[Soph]

three things:

• make copilot e2e work locally if normal auth is available
• add dismiss handling if copilot ends up in a slash command mode and
• skip one subagent test for copilot because copilot is not properly waiting for the subagent to finish

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Note

Low Risk
Low risk: changes are confined to E2E harness behavior (tmux input handling, env forwarding, and one test skip) and do not affect production logic, but may alter Copilot CLI test interactions and retry semantics.

Overview
Improves copilot-cli E2E stability by pre-clearing the input line before sending prompts, adding helpers to dismiss slash-command autocomplete, and retrying once when Copilot leaves an Unknown command: / state after submission.

Updates interactive session startup to optionally forward additional auth/config environment (XDG_CONFIG_HOME, GH_CONFIG_DIR) instead of hard-requiring COPILOT_GITHUB_TOKEN, enabling local runs that rely on existing gh/Copilot login state. Also skips TestSingleSessionSubagentCommitInTurn for copilot-cli due to non-deterministic background subagent completion ordering.

^{Written by Cursor Bugbot for commit 30d7798. Configure here.}

[Copilot]

Pull request overview

Improves the Copilot CLI E2E harness reliability and local usability by relaxing auth assumptions, adding input cleanup/retry handling for Copilot’s interactive UI quirks, and skipping an unstable Copilot-specific subagent commit test.

Changes:

• Skip the “subagent commit in turn” E2E test for copilot-cli due to Copilot background-subagent timing/hook ordering.
• Harden copilot-cli interactive sending by clearing the input line up front, dismissing autocomplete, and retrying when Copilot gets into a slash-command error state.
• Forward additional auth/config-related environment variables into the tmux session to support local auth (not just token auth).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
e2e/tests/single_session_test.go	Skips an unstable Copilot-only subagent/commit assertion.
e2e/agents/copilot-cli.go	Makes Copilot interactive tmux session more robust (env forwarding + input cleanup + retry logic).