v1.4.0 - Specify-before-rebuild, controlled documents, minor improvements

What's Changed

• Guide 06: state a ~5% tolerance band for size caps, and exempt technical cliffs by @KalastajaM in #44
• Guides 29 and 30: specify-before-rebuild, and controlled documents by @KalastajaM in #45
• Guide 25: note the description field's 500-character cap by @KalastajaM in #46
• Platform sweep 2026-09: bring the guides up to Claude Code v2.1.263 and desktop v1.46388.4, add review-platform-changes by @KalastajaM in #47
• Changelog: record v1.4.0, built from git log v1.3.0..HEAD; re-sync four drifted bundled guide copies by @KalastajaM in #48

Full Changelog: v1.3.0...v1.4.0