feat: ADR-0034 — history journal records err + replay parses/filters the journal

Replay (§3): run_replay parses <ts>|<status>|<source> journal records — runs ok, skips non-ok — while still accepting bare .commands scripts (prefix-detected so a | inside a bare command isn't misread). Fixes replay history.log, which died on line 1.

Journal failures (§1/§2): failed commands are recorded err via a new Action::JournalFailure, emitted by the pure-sync App for both parse failures and worker-execution failures (runtime appends best-effort, never fatal). Hydration reads all records so typo'd/rejected commands are recallable across sessions.

Amendment 1 — replay filters app-lifecycle commands: a working replay history.log exposed that the journal also records save as/load/new/export/import/rebuild/mode (which would panic the worker dispatch or abort replay). Replay now re-applies only schema/data writes and skips every app-lifecycle command + nested replay, classified by entry word so modal/incomplete forms (save as, bare mode) and quit skip uniformly rather than aborting. All skips continue (reversing the nested-replay refusal); import and nested replay warn. replay.error_nested removed; replay.skipped_import/_replay added; ReplayCompleted carries warnings. requirements.md U3/U4 updated; app-command runtime-failure journalling tracked as a follow-up.

1659 passing / 0 failing / 0 skipped / 1 ignored. Clippy clean.

tests/parse_error_pedagogy.rs

@@ -34,15 +34,16 @@ fn submit(app: &mut App) -> Vec<Action> {
 }
 
 /// Run `input` through the app and return every error-kind
-/// output line. Asserts the submission produced no actions
-/// (i.e. the parse failed).
+/// output line. Asserts the submission parse-failed — which now
+/// emits exactly a `JournalFailure` (ADR-0034: the failed line is
+/// journalled `err`) and dispatches no command to the worker.
 fn error_lines_for(input: &str) -> Vec<String> {
     let mut app = App::new();
     type_str(&mut app, input);
     let actions = submit(&mut app);
     assert!(
-        actions.is_empty(),
-        "expected parse failure (no actions) for {input:?}, got {actions:?}",
+        matches!(actions.as_slice(), [Action::JournalFailure { .. }]),
+        "expected parse failure (only a JournalFailure) for {input:?}, got {actions:?}",
     );
     app.output
         .iter()