* Fix#628: Add EBNF grammar for railroad diagram generation
Add a formal EBNF grammar file (grammar/chaiscript.ebnf) that can be
pasted into rr (https://www.bottlecaps.de/rr/ui) to produce navigable
railroad diagrams of ChaiScript's syntax. The grammar was validated
against the parser implementation and covers all language constructs
including class inheritance, guard conditions, raw strings, and const
declarations that were missing from the original proposal. A reference
section was added to the cheatsheet, and a regression test exercises
every documented grammar construct.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
* Address review: add grammar railroad diagram link to README
Add a Grammar section to readme.md linking to the EBNF grammar file
and to mingodad's railroad diagram generator for direct viewing.
Requested by @lefticus in PR #673 review.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Co-authored-by: leftibot <leftibot@users.noreply.github.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
