Editorial improvements and build tooling enhancements

[podborski]

Spec content (index.bs)

• Add explicit section anchors ({#id}) to all headings - eliminates Bikeshed duplicate-ID warnings and makes cross-references stable across revisions
• Remove unused ETSI-EN300468 bibliography entry
• Disable auto-generated Bikeshed conformance boilerplate (Boilerplate: conformance no). Redundant with section 1.1 which already defines normative language per ETSI Drafting Rules; move the informative note convention into section 1.1 instead
• Add clarification to section 1.2 explaining the mnemonic(N) syntax descriptor notation used in the syntax tables
• Fix a bunch of typos

Build tooling (compile.py)

• compile.py now substitutes today's date into the Date: metadata field on every build; add --date YYYY-MM-DD option to override
• Unify both build paths (SDL and --no-sdl) through a single temp file - simplifies the code and ensures date substitution applies in both modes
• Add build status output (mode, date, output path)
• Improve TOC for PDF

README

• Rewrite with proper structure: introduction, prerequisites, build instructions (both quick and full modes), known implementations, license

closes #57

[github-actions]

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• index.html — Specification with SDL syntax tables
• index.pdf — PDF version
• diff.html — Visual diff against base branch

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Built from commit 413ef51 • Wed, 25 Mar 2026 17:56:33 GMT