fix(agent): treat the session-budget expiry as a boundary, not a crash (#3658) - #3687

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-python@v5, astral-sh/setup-uv@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

452:121 [line-length] line too long (122 > 120 characters)

440:121 [line-length] line too long (136 > 120 characters)

432:121 [line-length] line too long (139 > 120 characters)

425:121 [line-length] line too long (128 > 120 characters)

394:121 [line-length] line too long (163 > 120 characters)

355:121 [line-length] line too long (143 > 120 characters)

182:121 [line-length] line too long (132 > 120 characters)

42:121 [line-length] line too long (151 > 120 characters)

37:121 [line-length] line too long (206 > 120 characters)