ADR-0043 D4 residual: an inline column-level FK (`<col> REFERENCES P(a,b)`)
is single-column by construction, so referencing a parent's compound PK
gave the generic arity error ("1 foreign-key column(s) on the child side,
but `P`'s key has 2..."). It now points the user at the table-level form:
"an inline column reference can only name one column ... Use the table-level
form instead: FOREIGN KEY (<columns>) REFERENCES P (a, b)".
- Adds `inline: bool` to SqlForeignKey, set by the grammar's single shared
builder consume_fk_reference (true for the inline path, false for the
table-level and ALTER paths).
- resolve_fk_parent_columns takes `inline` and tailors the arity-mismatch
message when an inline FK meets a compound key.
Tests: parse-layer (inline=true / table-level=false) + end-to-end worker
refusal wording. 2209 pass / 0 fail / 1 ignored. Clippy clean.
claude@clouddev1
6985a43f31