feat(spacecraft-standard): sync §8 Documentation (Texinfo) — v1.24

[UnbreakableMJ]

Summary

• Syncs spacecraft-standard/SKILL.md with Standard v1.24
• Adds §8 — Documentation (Texinfo) section (§8.1–§8.6), identical to the published standard
• Renumbers old §8–§15 → §9–§16 throughout (headers, cross-refs, compliance checklist)
• Adds §8 Texinfo checklist bullet in §16
• Updates Skill Cross-References table with Texinfo row
• Updates frontmatter description: v1.22 → v1.24, notes §8 Texinfo and §15.2 email obfuscation
• Updates intro text: "14-point checklist in §15" → "15-point checklist in §16"
• Fixes §13 UI/UX palette cross-reference §10→§11

Depends on: Spacecraft-Software/Standard#5

Test plan

• Section headers match Standard v1.24 (§1–§16)
• §8 content complete and identical to Standard
• Frontmatter version: 1.24, date: 2026-06-19
• Checklist has §8 Texinfo bullet and updated §11.1 / §14.2.1 / §15.3 refs
• Skill Cross-References table has Texinfo row

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