update skills

[dxiao2003]

add check during eng review to make sure we have basics like environment defined in the spec

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[buddy7599bot]

Heads-up on a likely conflict: this PR and the open #1812 (fix(plan-eng-review): add substrate-neutral platform-capability check) both edit plan-eng-review/SKILL.md and plan-eng-review/SKILL.md.tmpl to insert a new pre-review prerequisite/capability section. They overlap thematically (both gate the review on environment/platform basics) and will conflict on those two files once either merges.

The numbering cleanup here is also legit and worth keeping: section 905-ff currently has two items numbered 5. (TODOS cross-reference and Completeness check); this PR renumbers Completeness→6 and Distribution→7. If #1812 doesn't already do that, this is the canonical place for it.

Suggest the two get sequenced and reconciled — ideally one PR adds the prerequisites/capability checks and the other rebases on top — rather than landing both independently. Also: this only touches the tracked SKILL.md + .tmpl; please double-check check-freshness passes (the generator should keep them in sync) so CI doesn't flag drift. A more descriptive PR title than "update skills" would help maintainer triage too.