Amendment 2 records the §10.6 fixup-pass mechanism choice. §10.6
prescribes "rewriting the highlight class" on projection-list
idents at end-of-walk; the actual implementation uses a different
mechanism that achieves the identical user-visible behavior:
1. 2d's two-pass schema-existence diagnostic collects every FROM
binding from the matched path first, then resolves projection
idents against the complete scope. The post-walk re-resolve
§10.6 calls for, just embedded in the diagnostic emitter.
2. input_render.rs's diagnostic-overlay path colors each
diagnostic span Error/Warning, achieving the visual change
§10.6 describes without needing a new HighlightClass variant.
The completion-mid-typing piece is improved by the §10.5
look-ahead probe (sub-phase 2e earlier).
Four new regression tests in `projection_before_from_tests` pin
the behavior so a future refactor can't silently regress it:
correct ident resolves silently, unknown ident flags via
diagnostic on its span, multi-projection only flags unknowns,
projection-without-FROM is silent.
ADR index entry updated to reference Amendment 2.
Test totals: 1424 → 1428 passing (+4). Clippy clean.
claude@clouddev1
ee0dafd86b