Advanced-mode hinting + completion-preview were dead: render_hint_panel
returned None for advanced mode (stale ADR-0022 §12 gate, predating the
SQL grammar) and the hint resolver/ambient_hint never threaded Mode, so a
SQL statement was gated as "this is SQL". The unified walker (ADR-0030/
0031/0032) speaks SQL, so this lifts the gate.
- ambient_hint_in_mode + hint_resolution_at_input_in_mode +
expected_for_hint_snapshot(mode); candidate/diagnostic/parse sub-calls
run in the active mode.
- render_hint_panel calls ambient for all modes; one-shot `:` sigil
stripped (strip_one_shot_prefix) so `: sel` hints `select`.
- ADR-0022 Amendment 1 + README index.
Found by manual advanced-mode testing; Phase 2 marked SQL hint/completion
green at the engine layer but never exercised the UI. App-level render
test (advanced_mode_hint_panel_surfaces_sql_candidates) + ambient-layer
regression locks. 1466 baseline green.
claude@clouddev1
ed40445828