The C5a design: a stratified, recursive WHERE-expression
grammar (AND/OR/NOT, comparisons, LIKE, IS NULL, IN,
BETWEEN) for update / delete / show-data filters; show
data gains optional `where` and `limit`. Adds the
`Subgrammar` reference-following grammar node and a
recursive `Expr` AST, built selectively for the
expression fragment.
- docs/adr/0026-complex-where-expressions.md — the ADR.
- docs/adr/README.md — index entry.
- docs/simple-mode-limitations.md — new running list of
simple-mode query boundaries vs. advanced SQL, seeded
from ADR-0026.
- docs/requirements.md — C5a [~] -> [ ] (designed, not
yet implemented); new Documentation section with DOC1.
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