claude@clouddev1
8188fa5ee1
Pre-Phase-D, `save ` parsed as a complete `save` command, so the completion engine had nothing to mine: `as` never surfaced as a Tab candidate. This is the round-5 gap the handoffs have been tracking. `WalkResult` gains a `tail_expected: Vec<Expectation>` field. The walker's top-level `Matched` branch copies the outer shape's skipped-Optional expectations into it. `expected_at_input` returns `tail_expected` on `Match` so the completion engine sees the optional-suffix continuations and offers them as Tab candidates. `hint_mode_at_input` deliberately does NOT consume `tail_expected` — surfacing prose like "Type a name" at the end of a valid command would be misleading. A new private `expected_for_hint` returns empty on `Match` to preserve this. The split distinguishes "valid + could continue" (completion helps) from "invalid + must continue" (hint resolver helps). Tests: - `save ` Tab → `as` (new test, the original round-5 gap). - `messages ` Tab → `short` and `verbose` (same shape). - Existing `hint_mode_none_for_complete_command` stays green because hint resolver ignores tail_expected. - 830 total passing, 0 failing, 1 ignored. Clippy clean.