claude@clouddev1
8214e4136a
Per the user's #5: "if our candidate selection works correctly, then entering a character that removes all matches is the same as entering an invalid token." Closes the loop between schema cache (8c/8d) and live error feedback (4). New `completion::invalid_ident_at_cursor(input, cursor, cache)` returns `Some(InvalidIdent { range, found, slot })` when: - the cursor is on a partial identifier-shaped token; - the parser's expected-set at the start of that token contains a known-set IdentSlot (TableName / Column / RelationshipName); - no schema entry across those slots prefix-matches the typed text. `render_input_runs` extended to take a `&SchemaCache` and overlay the invalid-identifier range with `tok_error` — same visual treatment as the parse-error overlay (4), unified red signal regardless of which detector fires. `ambient_hint` extended to surface `hint.ambient_invalid_ident` when invalid_ident_at_cursor returns Some — wording "no such {kind}: `{found}`" mirrors ADR-0019's engine-error voice for consistency. Catalog + KEYS_AND_PLACEHOLDERS declaration added; validator passes. Render priority: candidates win over invalid-ident (if any schema match exists for the partial prefix, the state is "in-progress completion" not "invalid"). Falls through to the existing parse-error/incomplete/Valid framings otherwise. NewName slots are filtered out at the source — typing into a "user invents this name" position is never invalid (per `IdentSlot::completes_from_schema`). Tests: 744 passing, 0 failing, 1 ignored (738 baseline → +6: 5 invalid_ident_at_cursor cases covering unknown-prefix-fires, prefix-match-doesn't-fire, NewName-immune, no-cursor-token, keyword-slot-immune; plus 1 ambient_hint integration test). Clippy clean. This closes ADR-0022. Stages 1-8e together deliver the ambient-typing-assistance feature: token highlighting, error overlay, hint panel ambient, hint panel multi- candidate display with scroll markers, Tab/Shift-Tab cycling with one-keystroke Esc/Backspace undo, schema-aware identifier completion, and invalid-identifier live feedback. Total stage-8 footprint: 5 commits, ~1600 lines.