grammar: SQL SELECT end-to-end (ADR-0030 Phase 1)

The first cut of advanced-mode SQL: a `select` line in advanced
mode parses, runs against the database, and renders its rows
through the existing data-table renderer; the same line in
simple mode lights up the precise "this is SQL" hint instead of
running.

Walker mode gate (ADR-0030 §2)
------------------------------
- `WalkContext` gains a `mode: Mode` field; `Mode` derives
  `Default` (= `Simple`, matching the app's startup mode).
- `grammar::is_advanced_only` keys an advanced-only entry-word
  set (Phase 1: just `select`). When the walker matches an
  advanced-only entry word with `ctx.mode == Simple`, it
  short-circuits to a `WalkOutcome::ValidationFailed` carrying
  the `advanced_mode.sql_in_simple` catalog key — the input
  highlights as a keyword, the validity indicator goes ERROR,
  and the parse-error layer renders the "switch with `mode
  advanced`, or prefix the line with `:`" hint.
- `parser::parse_command_with_schema_in_mode` (and the
  schemaless `parse_command_in_mode`) threads the mode into
  `WalkContext`; existing `parse_command*` entry points default
  to `Mode::Advanced` (most permissive) so back-compat callers
  see the full grammar.
- `App::submit` is unified: both modes route through
  `dispatch_dsl(&effective_input, effective_mode)`, which now
  parses with the line's effective mode. The placeholder
  advanced-mode echo branch is gone.

Builder signature sweep (ADR-0031 §2)
-------------------------------------
- `CommandNode.ast_builder` gains a `source: &str` parameter,
  forwarded by the walker. `build_select` reads it to put the
  validated SQL text into `Command::Select`; the 21 existing
  builders accept it as `_source`.

SQL `SELECT` (ADR-0030 §6, ADR-0031)
-------------------------------------
- New `Command::Select { sql: String }` variant. Every
  exhaustive `match Command` updated (`verb`, `target_table`,
  `build_translate_context`, `execute_command_typed`,
  `typing_surface`'s label).
- `grammar::data::SELECT` `CommandNode`: projection (`*` or
  `expr [as alias]` list), optional `FROM <table>`, optional
  `WHERE`/`ORDER BY`/`LIMIT`, optional trailing `;`. The
  expression slots reference the ADR-0031 fragment through
  `Subgrammar(&sql_expr::SQL_OR_EXPR)`. The `FROM` table-name
  slot carries a `reject_internal_table` validator that
  refuses `__rdbms_*` references at parse time.
- The `FROM` clause is optional — `select 1`, `select upper('x')`
  (zero-table constant/function-call SELECTs) work alongside
  the single-table form. Standard SQL admits them and they are
  the canonical learner probe.
- Implicit projection aliasing (`select a x`) is deliberately
  unsupported — `from` is a keyword, the bare alias would be
  ambiguous; only `select a as x` is admitted.

Worker / runtime
----------------
- `Request::RunSelect { sql, source, reply }` + a new
  `Database::run_select` method. `do_run_select_request` runs
  the prepared statement, collects rows into a `DataResult`
  with `column_types: Vec<None>` (Phase-1 SELECT result columns
  carry no playground type per ADR-0030 §6), and appends the
  literal source line to `history.log` so replay re-runs it
  (ADR-0030 §11).
- `runtime::execute_command_typed` gains a `Command::Select`
  arm that calls `database.run_select(sql, src)` and maps to
  `CommandOutcome::Query`, which flows into the existing
  `AppEvent::DslDataSucceeded` → `render_data_table` path.

Catalog (ADR-0019)
------------------
- `advanced_mode.sql_in_simple` — the walker's gate message.
- `select.internal_table` — the `__rdbms_*` rejection.
- `parse.usage.select` — the parse-error usage template.

Tests
-----
Two `app::tests` cases that pinned the pre-ADR-0030 placeholder
echo are updated to pin the new dispatch contract — both verify
that the advanced-mode `select` (one persistent, one via the
`:` one-shot) produces `ExecuteDsl(Command::Select)` with the
submission's effective mode tagged on the echo. The matching
walking-skeleton test is updated likewise.

A separate follow-up commit lands the ambient mode-threading
(completion / live overlay / validity indicator) so simple-mode
users do not see SQL surfaced through Tab or the live error
overlay either — the dispatch-layer gate landed here is the
behavioural foundation that follow-up builds on. Integration
tests for the full end-to-end land in a third commit.

src/dsl/walker/mod.rs

@@ -865,6 +865,37 @@ pub fn walk<'a>(
         class: grammar::HighlightClass::Keyword,
     });
 
+    // Mode gate (ADR-0030 §2): an advanced-only command (a SQL
+    // form) typed in simple mode is *recognised as SQL* and
+    // yields a precise hint — "this is SQL; switch with `mode
+    // advanced`, or prefix the line with `:`" — rather than
+    // being walked normally or rejected as an unknown command.
+    // The entry word stays highlighted as a keyword (it is one);
+    // the input carries an ERROR verdict (it will not run here).
+    if ctx.mode == crate::mode::Mode::Simple
+        && grammar::is_advanced_only(command_node.entry.primary)
+    {
+        return (
+            Some(WalkResult {
+                outcome: WalkOutcome::ValidationFailed {
+                    position: kw_start,
+                    error: crate::dsl::grammar::ValidationError {
+                        message_key: "advanced_mode.sql_in_simple",
+                        args: vec![(
+                            "command",
+                            command_node.entry.primary.to_string(),
+                        )],
+                    },
+                },
+                matched_path: path,
+                per_byte_class: per_byte,
+                diagnostics: Vec::new(),
+                tail_expected: Vec::new(),
+            }),
+            None,
+        );
+    }
+
     let mut tail_expected: Vec<Expectation> = Vec::new();
     let outcome = match walk_node(
         effective_source,
@@ -937,7 +968,7 @@ pub fn walk<'a>(
     // the catalog wording correctly) rather than as a generic
     // "AST builder failed" fallback.
     let (final_outcome, cmd) = match outcome {
-        WalkOutcome::Match { .. } => match (command_node.ast_builder)(&path) {
+        WalkOutcome::Match { .. } => match (command_node.ast_builder)(&path, source) {
             Ok(c) => (outcome, Some(c)),
             Err(error) => (
                 WalkOutcome::ValidationFailed {