feat(history): mode-tagged history + top-of-chain journaling (#30)

Record the submission mode per history entry so advanced commands are
reusable in simple mode, and fix the bug where a ':'-one-shot command
lost its ':' across sessions (ADR-0052, closing #30).

Format: the history.log status token gains an optional ':adv' suffix
(ok / ok:adv / err / err:adv); 'source' stays last and canonical, so
replay is unaffected. The in-memory ring (still Vec<String>) stores
advanced entries ': '-prefixed; recall strips the ':' in advanced mode
and keeps it in simple; hydration reconstructs the prefix from the tag.

Journaling moved from the worker to the dispatch layer (spawn_dsl_-
dispatch / run_replay / app-command sites), where the mode is in scope
with no worker plumbing; finalize_persistence writes only yaml/csv
(commit-db-last still atomic for state). The journal write is now
best-effort (command already committed), consistent with the failure
path. App commands journal simple, so they recall bare. Journaling is
now uniform (every successful command, per ADR-0034) — closing a gap
where show tables/relationships/explain didn't journal.

Amends ADR-0034 (status tag + journaling location), ADR-0015 §6
(history.log out of the worker tx), ADR-0040 (journal-write best-effort).
15 worker-level journaling tests retired, re-covered at the new layer
(history.rs format, app.rs recall matrix, iteration6 cross-session
regression, replay). 2471 pass / 0 fail / 0 skip, clippy clean.

src/persistence/history.rs

@@ -28,7 +28,35 @@ use super::PersistenceError;
 pub(super) const STATUS_OK: &str = "ok";
 pub(super) const STATUS_ERR: &str = "err";
 
-/// Format a successful-command record. Pure; no I/O.
+/// The optional status suffix marking an advanced-mode submission
+/// (ADR-0052, issue #30): `ok:adv` / `err:adv`. Recorded so that
+/// hydration can reconstruct the `:`-prefixed runnable form of an
+/// advanced command, making advanced history reusable in simple mode.
+pub(super) const ADV_SUFFIX: &str = "adv";
+
+/// Build the status token for a `base` (`ok`/`err`) and submission mode.
+pub(super) fn status_token(base: &str, advanced: bool) -> String {
+    if advanced {
+        format!("{base}:{ADV_SUFFIX}")
+    } else {
+        base.to_string()
+    }
+}
+
+/// Parse a status token into `(is_ok, advanced)` (ADR-0052). The base
+/// (`ok` ⇒ replayable, anything else ⇒ skip) precedes an optional
+/// `:adv` mode suffix. An unknown base degrades to `(false, _)`, so
+/// replay skips it rather than mis-running it.
+pub(super) fn parse_status(status: &str) -> (bool, bool) {
+    let (base, suffix) = status.split_once(':').unwrap_or((status, ""));
+    (base == STATUS_OK, suffix == ADV_SUFFIX)
+}
+
+/// Format a successful-command record. Pure; no I/O. (Simple-mode
+/// convenience used by tests; production threads the mode through
+/// [`format_record_with_status`] + [`status_token`], so this is
+/// test-only since ADR-0052.)
+#[cfg(test)]
 pub(super) fn format_record(command_text: &str, timestamp_iso: String) -> String {
     format_record_with_status(command_text, timestamp_iso, STATUS_OK)
 }
@@ -100,9 +128,20 @@ fn parse_record_source(line: &str) -> Option<String> {
     // characters) is preserved.
     let mut parts = line.splitn(3, '|');
     let _ts = parts.next()?;
-    let _status = parts.next()?;
+    let status = parts.next()?;
     let source = parts.next()?;
-    Some(unescape_command(source))
+    let (_is_ok, advanced) = parse_status(status);
+    let command = unescape_command(source);
+    // ADR-0052: an advanced record is hydrated in its `:`-prefixed
+    // simple-mode runnable form, so cross-session recall matches the
+    // in-session ring (and recall strips the `:` again in advanced
+    // mode). A simple record hydrates bare. Old `ok`/`err` logs have no
+    // `:adv` suffix → read as simple, unchanged.
+    Some(if advanced {
+        format!(": {command}")
+    } else {
+        command
+    })
 }
 
 /// A parsed journal record (ADR-0034 §3). `source` is already
@@ -129,8 +168,11 @@ pub(super) fn parse_journal_record(line: &str) -> Option<JournalRecord> {
     if !looks_like_iso8601(ts) {
         return None;
     }
+    // ADR-0052: the status may carry a `:adv` mode suffix; replayability
+    // keys off the base token only (`ok` / `ok:adv` are both ok).
+    let (status_is_ok, _advanced) = parse_status(status);
     Some(JournalRecord {
-        status_is_ok: status == STATUS_OK,
+        status_is_ok,
         source: unescape_command(source),
     })
 }
@@ -436,4 +478,70 @@ mod tests {
         let body = fs::read_to_string(&path).unwrap();
         assert_eq!(body, "first|ok|a\nsecond|ok|b\n");
     }
+
+    // ---- ADR-0052 (issue #30): mode tag in the status field ----
+
+    #[test]
+    fn status_token_builds_and_parses_the_adv_suffix() {
+        assert_eq!(status_token(STATUS_OK, false), "ok");
+        assert_eq!(status_token(STATUS_OK, true), "ok:adv");
+        assert_eq!(status_token(STATUS_ERR, true), "err:adv");
+        assert_eq!(parse_status("ok"), (true, false));
+        assert_eq!(parse_status("ok:adv"), (true, true));
+        assert_eq!(parse_status("err"), (false, false));
+        assert_eq!(parse_status("err:adv"), (false, true));
+        // Unknown base → not ok (replay skips it), simple.
+        assert_eq!(parse_status("frobnicate"), (false, false));
+    }
+
+    #[test]
+    fn read_recent_sources_reconstructs_colon_prefix_for_advanced() {
+        // An advanced record (`ok:adv`) hydrates in its `:`-prefixed
+        // simple-mode runnable form; a simple record stays bare. This is
+        // the cross-session half of the issue #30 fix.
+        let dir = tempfile::tempdir().unwrap();
+        let path = dir.path().join("history.log");
+        let adv = format_record_with_status(
+            "select * from T",
+            "2026-06-13T10:00:00Z".to_string(),
+            &status_token(STATUS_OK, true),
+        );
+        let simple = format_record_with_status(
+            "create table T with pk",
+            "2026-06-13T10:00:01Z".to_string(),
+            &status_token(STATUS_OK, false),
+        );
+        std::fs::write(&path, format!("{adv}{simple}")).unwrap();
+        let got = read_recent_sources(&path, 10).unwrap();
+        assert_eq!(
+            got,
+            vec![
+                ": select * from T".to_string(),
+                "create table T with pk".to_string(),
+            ],
+        );
+    }
+
+    #[test]
+    fn parse_journal_record_treats_ok_adv_as_ok() {
+        // Replay keys off the base token, so `ok:adv` replays like `ok`
+        // (source stays canonical).
+        let rec = parse_journal_record("2026-06-13T10:00:00Z|ok:adv|select * from T")
+            .expect("ok:adv journal record");
+        assert!(rec.status_is_ok);
+        assert_eq!(rec.source, "select * from T");
+        let err = parse_journal_record("2026-06-13T10:00:00Z|err:adv|select bad")
+            .expect("err:adv journal record");
+        assert!(!err.status_is_ok);
+    }
+
+    #[test]
+    fn old_three_field_log_reads_as_simple() {
+        // Back-compat: a pre-ADR-0052 log (no `:adv`) hydrates bare.
+        let dir = tempfile::tempdir().unwrap();
+        let path = dir.path().join("history.log");
+        std::fs::write(&path, "2026-01-01T00:00:00Z|ok|select 1\n").unwrap();
+        let got = read_recent_sources(&path, 10).unwrap();
+        assert_eq!(got, vec!["select 1".to_string()]);
+    }
 }