Squashed net diff of PR #1426 (github-base-token-improve): slim
lark-base SKILL.md + formula/workflow references, split the workflow
guide/schema into per-step references, add guess-tolerant flag aliases
and misuse hints for base record shortcuts (with containment-based
suggest), and drive import adjustments.
Combined onto eval/skills-combined alongside #1450#1389#1395#1410.
Change-Id: Iab1f0c4f1a4c93fd9dbd49bc702cb0ef41022bda