v1.72.1.0 fix(office-hours): add Q<N> open-question prose fallback for Conductor sessions (#2719)

[BharadwajMittapelli]

Description

Fixes #2719.

When running inside a Conductor session (CONDUCTOR_SESSION: true), the AskUserQuestion tool is disabled, forcing the runtime to fall back to prose rendering. Previously, the prose fallback instructions in SKILL.md only defined the D<N> Decision Brief format. Because Phase 2A and 2B startup-diagnostic questions are open-ended and have no option sets, the model was unable to fit them into the D<N> format and silently dropped the diagnostic phase.

Changes Implemented

1. Added Q<N> Prose Form: Added Form 1 (Q<N>) Open-Question Prose Form to generate-ask-user-format.ts alongside the existing Form 2 (D<N>) Decision Brief format.
2. Updated Frontmatter: Added open_question_tag_prefix: "Q" to office-hours/SKILL.md.tmpl.
3. Updated Phase Guidance: Added explicit instructions to Phase 2A and Phase 2B sections instructing the runtime to use the Q<N> prose form for open-ended diagnostic questions when AskUserQuestion is unavailable.
4. Regenerated Skills: Regenerated all skill templates and updated version to 1.72.1.0.
5. Tests: Added 11 new unit tests in test/resolver-ask-user-format.test.ts and updated mandatory load tests in test/auq-format-always-loaded.test.ts (all passing).

CC: @michaeladair44

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