Fix/strip only cr in session

[carlosejimenez]

• This PR updates the command input and output processing
• Remove windows-style "crlf" line endings from pexpect outputs
• Remove extra endline from echo in local.BashSession._run_normal's fallback UNIQUE_STRING based output parsing
• Updates tests related to execution / testing output to be even stricter

This update makes outputs more reliable, consistent, and true to standard unix shells' expected output. For instance, outputs of echo commands will include a training newline, which was being stripped before.

[Copilot]

Pull Request Overview

This PR enhances newline handling by stripping Windows-style CRLFs, preserving intended newlines in session outputs, and updating tests to expect exact trailing newlines.

• Strip \r\n to \n in control-character removal
• Remove .strip() calls to keep command output newlines
• Change fallback marker to use echo -n and tighten test assertions

Reviewed Changes

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

File	Description
tests/test_execution.py	Updated test assertions to require exact trailing newlines
src/swerex/runtime/local.py	Added CRLF normalization, removed stripping of output, tweaked echo

Comments suppressed due to low confidence (3)

src/swerex/runtime/local.py:95

• [nitpick] Consider moving the ANSI regex compilation to a module-level constant to avoid recompiling it on every call to _strip_control_chars.

ansi_escape = re.compile(r"\x1B[@-_][0-?]*[ -/]*[@-~]")

tests/test_execution.py:65

• [nitpick] The test name test_execute_command_with_echon is misleading; consider renaming to test_execute_command_with_echo_n for clarity.

async def test_execute_command_with_echon(remote_runtime: RemoteRuntime):

tests/test_execution.py:55

• Add a test that simulates Windows-style CRLF output (e.g., via printf 'line1\r\nline2\r\n') to verify the new CRLF normalization logic.

async def test_execute_command_with_empty_string_in_session(runtime_with_default_session: RemoteRuntime):