fix(runtime): reject non-boolean goal evaluation flags

[Totoro-qaq]

Summary

Fixes #4736

Boolean("false") currently turns an invalid judge response into a valid Goal verdict. Reject non-boolean met, impossible, progress, or waiting fields as a neutral evaluator failure. Missing flags still default to false, and valid boolean judgments are unchanged.

This keeps malformed evaluations from terminating or waiting a Goal, or changing its no-progress counter. The change adds no dependencies, model calls, or state. JSON extraction, prompts, and Todo behavior are unchanged.

Verification

• Rebuilt the runtime before testing. The evaluator/continuation regression run was 68 passed, 33 failed before the fix → 101 passed, 0 failed after it.
• The regressions feed raw synthetic judge output through the real continuation coordinator, checking that the Goal stays active, keeps its existing no-progress count, and admits the next turn.
• Full runtime suite: 3,243 passed, 0 failed, 13 skipped. This PR adds no skips.
• Runtime Host Goal coordinator/root-authority/protocol tests: 23 passed.
• npm run lint, npm run format:check, npm run build, npm run typecheck: passed.
• Both documented Knip workspace checks passed. ASF header check passed on a clean worktree of the proposed commits.
• Evaluator coverage: 95.77% lines, 92.11% branches, 90% functions.

Minimal reproduction output for a string "false" flag:

Before: parsedMet=true,  evaluatorFailed=false
After:  parsedMet=false, evaluatorFailed=true

Not run: the full all-workspace test matrix or live-provider E2E. The issue contains the standalone reproduction command; no API credentials are needed.

AI use

• No generative tool made a substantive contribution
• Generative tooling made a substantive contribution

Tool(s) and scope: Codex assisted with investigation, implementation, regression tests, and local verification. AI-authored commits include Generated-by: Codex.

Checklist

• Tests cover the change and fail without it
• Lint, format, typecheck and the affected suites pass locally

Does this PR entail a change in behavior?

• Yes — described under Summary above
• No