docs: reconcile requirements/CLAUDE.md with shipped reality (high-confidence)

Flip stale Phase-1 checkboxes whose capability is clearly delivered:
M1/M2/M3 (modes), Q1/Q2 (SQL subset — shipped via the unified walker, not
sqlparser-rs), TT1/TT2/TT3 (test tiers 1–3) → [x]; TT4 (PTY e2e, critical
flows only) → [~].

Fix stale CLAUDE.md claims: the stack no longer uses chumsky (DSL) or a
reserved sqlparser-rs (SQL) — both retired (ADR-0024 §migration Phase F);
the DSL and advanced-mode SQL are both parsed by the unified grammar
walker (ADRs 0024 / 0030–0036). Corrects the stack note, drops the
now-done "SQL handling in advanced mode" deferred bullet, and updates the
parser.rs layout comment.

Lower-confidence items (C1 rename, A1, I1a, I3, I4, T3, V2, export/import,
resume) left for a dedicated per-item reconciliation pass (handoff-45 §5).

CLAUDE.md

@@ -22,9 +22,13 @@ new ADR that supersedes the old one.
 
 Current decisions at a glance (each backed by an ADR):
 
-- **Stack:** Rust + Ratatui + Crossterm; `sqlparser-rs` reserved
-  for SQL (advanced mode, not yet wired); `chumsky` for the DSL;
-  `rusqlite` for the database (ADR-0001).
+- **Stack:** Rust + Ratatui + Crossterm; both the DSL and
+  advanced-mode SQL are parsed by a single hand-rolled
+  grammar/walker (ADR-0024's unified grammar tree; SQL added by
+  ADRs 0030–0036) — superseding ADR-0001's original plan of
+  `chumsky` for the DSL + a reserved `sqlparser-rs` for SQL
+  (neither is a dependency now); `rusqlite` for the database
+  (ADR-0001).
 - **Backend:** SQLite with `STRICT` tables and FK enforcement on
   (ADR-0002). Database access through a dedicated worker thread
   with mpsc/oneshot request channels (ADR-0010).
@@ -116,7 +120,7 @@ Current decisions at a glance (each backed by an ADR):
 │   │   ├── action.rs          # ReferentialAction enum + parsing
 │   │   ├── command.rs         # Command AST + RelationshipSelector + RowFilter
 │   │   ├── mod.rs             # re-exports
-│   │   ├── parser.rs          # chumsky grammar (all DSL commands)
+│   │   ├── parser.rs          # parse entry point → unified-grammar walker
 │   │   ├── shortid.rs         # base58 generator + validator
 │   │   ├── types.rs           # user-facing Type enum + fk_target_type
 │   │   └── value.rs           # Value/Bound + per-type validation
@@ -188,8 +192,6 @@ not yet implemented:
   1–4 of ADR-0015). Pending pieces: `export` / `import` (Iter
   5), `--resume` + persistent input history hydration +
   migration framework scaffold (Iter 6).
-- **SQL handling in advanced mode** (Q1): `sqlparser-rs` parser
-  + a defined SQL subset (Q4 — its own ADR).
 - **Column drops/renames/type changes** (B2 / C2 partial): the
   rebuild-table primitive (ADR-0013) is in place; the grammar
   and dispatch are pending.