feat(criteria): pass_context for run_command + node_modules/.bin PATH hardening

[uipreliga]

What

Adds an opt-in pass_context: true to the run_command success criterion. When set, the criterion serializes the in-flight EvaluationResult (the task.json schema) to a temp file and points the scoring command at it via $CODER_EVAL_CONTEXT — giving scoring scripts the agent trajectory and the resolved task config, not just the sandbox filesystem.

The decisive payoff: script authors can develop offline against a real task.json from a previous run (zero agent runs, zero API cost), then wire the same script in unchanged.

- type: run_command
  command: "python score.py"   # reads json.load(open(os.environ["CODER_EVAL_CONTEXT"]))
  score_from_stdout: true
  pass_context: true
  description: "Score derived from the agent trajectory"

How

• extra_env on Sandbox.run_command — additional env vars layered last-wins onto the built environment, guarded so it cannot clobber the sandbox-isolation floor (PATH / VIRTUAL_ENV / NODE_PATH / NPM_CONFIG_PREFIX). Also corrects a stale Raises: subprocess.TimeoutExpired docstring (the method returns (-1, "", msg) on timeout).
• Context threading — Orchestrator → SuccessChecker → CheckContext.run_result → RunCommandChecker. _check_impl's signature is unchanged; the new state rides on CheckContext. _serialize_context force-clears success_criteria_results via a non-mutating model_copy, so scripts can't depend on their position in the YAML or leak prior-turn verdicts (simulation every_turn mode). The temp dir is deleted on every exit path including the timeout return, and a missing run_result fails closed to score=0.0.
• Security hardening — node_modules/.bin (agent-writable) is now appended, not prepended, to PATH, so an agent that plants an interpreter shim (python/node/sh/uv) there can no longer hijack a scoring command's interpreter.

Notes

• ⚠️ Behavior change (release note): a bare CLI name (e.g. tsc) present in both node_modules/.bin and on the host/venv PATH now resolves to the host binary instead of the sandbox-local one. A suite-wide spike found zero tasks under tasks/ that depend on this ordering.
• No new criterion type — the criterion count stays 14. No config-merge, experiments/default.yaml, or models/__init__.py changes (pass_context is a criterion field, not a merge root).
• Docs updated: docs/TASK_DEFINITION_GUIDE.md (field-table row + worked example + the success_criteria_results-always-empty / provisional-fields rules) and CLAUDE.md.

Testing

• New coverage: model defaults + extra="forbid" parity, checker-tier (env injection, payload round-trip, empty success_criteria_results, non-mutation, fail-closed, timeout cleanup), end-to-end integration through a real tempdir Sandbox, and sandbox security (interpreter-shim exploit regression + package-local-CLI compatibility + PATH ordering + extra_env protected-key guard).
• Full suite green — 3447 passed, 90.91% coverage. make verify clean (format / check / pyright / pytest / custom CExxx lint).

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