v1.40.1.0 fix: add no-tool AskUserQuestion fallback

[rocke2020]

Summary

• Replace the hard BLOCKED path when no AskUserQuestion tool is available with an explicit normal-chat decision brief fallback.
• Update plan-mode skill invocation wording to point at the same fallback.
• Regenerate host skill docs and refresh ship golden fixtures.
• Bump release metadata to v1.40.1.0 after allocator found PR v1.40.0.0 fix wave: gbrain sync hardening (8 community PRs + migration) #1547 already claims v1.40.0.0.

Test Coverage

• PASS: bun test test/resolver-ask-user-format.test.ts test/model-overlay-opus-4-7.test.ts
• PASS: bun test test/host-config.test.ts
• PASS: bun test test/gen-skill-docs.test.ts
• PASS: git diff --check and git diff --check upstream/main...HEAD
• NOTE: bun run skill:check still exits 1 on the existing top-level claude/SKILL.md generated-file check; Codex/OpenClaw/Hermes/etc. generated skills are fresh and OK.
• NOTE: default full bun test was attempted; it emitted environment-dependent failures around missing gbrain CLI/daemon readiness unrelated to this AUQ fallback change.

Pre-Landing Review

• Scope is limited to resolver text, generated SKILL.md outputs, ship golden fixtures, and release metadata.
• No data or database paths touched.