fix: [#91] Fix build success detection for negative exit codes

[nandanosql]

Fixes #91

Problem

In docker_manager.py, the _execute_interactive method uses regex (\d+) to capture the exit code from shell commands. This fails to match negative exit codes like -1 (returned on timeout or error), causing the success detection to be incorrect.

Solution

Changed the regex from (\d+) to (-?\d+) to allow an optional leading minus sign. This enables proper detection of:

• Success: exit code 0
• Failure: any non-zero exit code (positive or negative like -1)

Changes

• In docker_manager.py line ~183: Changed regex pattern from r"(\d+)" to r"(-?\d+)"

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