feat(standard): add §8 Documentation (Texinfo) — v1.24

[UnbreakableMJ]

Summary

• Adds §8 — Documentation (Texinfo) as a new top-level section, establishing Texinfo as the first-class technical manual format for Spacecraft Software user-facing projects, following GNU project conventions
• §8.1: MUST for CLI/TUI/GUI apps; SHOULD for libraries; MAY skip for scripts
• §8.2: doc/<project>.texi, Makefile info/html/pdf targets
• §8.3: Required structural elements (@dircategory, @copying, @titlepage, @node Top, @menu)
• §8.4: .info / .html / .pdf outputs; install-info at package install time
• §8.5: CC-BY-SA-4.0 default; GFDL-1.3-or-later permitted for GPL software
• §8.6: Packaging integration (Guix/Nix/PKGBUILD)
• Renumbers old §8–§15 → §9–§16 throughout (headers, body cross-references, compliance checklist, Skill Cross-References table)
• Adds §8 bullet to the compliance checklist (now §16)
• Fixes §13 UI/UX cross-reference to color palette (§10→§11 after renumber)
• Bumps to v1.24 / 2026-06-19

Test plan

• All section headers §1–§16 present and in order (grep "^## §")
• §8 content complete (§8.1–§8.6)
• No stale §13 body references outside the §13 UI/UX section
• No stale §14.x references outside the §14 Date/Time section
• Compliance checklist has 15 normative bullets + §6.3 signing bullet
• Skill Cross-References table includes Texinfo row
• v1.24 changelog entry at top of §1

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