fix(novita): ARG longest-match + example readiness cleanup

[cursor]

Summary

Post-0.6.0 follow-up (explicitly not for Thursday’s release cut) for the two latent Novita items Ben asked to track:

1. _resolve_from_references now substitutes ARG defaults longest-name-first and matches unbraced $NAME with a word-boundary lookahead, so ARG BASE before ARG BASE_IMAGE can no longer turn FROM $BASE_IMAGE into python:3.12_IMAGE.
2. examples/novita_tbench2_simple.py moves wait_for_ready inside the try/finally, so a readiness timeout still calls stop_container.

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation
• New environment
• Refactoring

Alignment Checklist

Before submitting, verify:

• I have read .claude/docs/PRINCIPLES.md and this PR aligns with our principles
• I have checked .claude/docs/INVARIANTS.md and no invariants are violated
• I have run focused lint/tests on the changed files

RFC Status

• Not required (bug fix, docs, minor refactoring)
• RFC exists: #___
• RFC needed (will create before merge)

Test Plan

• PYTHONPATH=src:envs uv run pytest tests/test_core/test_novita_provider.py -q — 103 passed (includes new test_resolve_unbraced_arg_does_not_prefix_longer_name)
• ruff check / ruff format --check on the three changed files — clean

Claude Code Review

N/A — release-automation follow-up from Ben’s Slack ask.

  

[cursor]

Duplicate of #1235 (parallel sibling run for the same Ben ask). Prefer #1235; please close this PR. Tip here also has longest-first ARG expand + example readiness cleanup, plus an unbraced word-boundary guard #1235 can optionally adopt.

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_{Sent by Cursor Automation: Release}