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.

src/friendly/keys.rs

@@ -468,10 +468,11 @@ pub const KEYS_AND_PLACEHOLDERS: &[(&str, &[&str])] = &[
     ("replay.command_echo", &["command"]),
     ("replay.completed", &["path", "count"]),
     ("replay.error_could_not_open", &["path", "detail"]),
-    ("replay.error_nested", &[]),
     ("replay.error_parse", &["detail"]),
     ("replay.failed_at_line", &["path", "line_number", "error"]),
     ("replay.failed_open", &["path", "error"]),
+    ("replay.skipped_import", &["line", "command"]),
+    ("replay.skipped_replay", &["line", "command"]),
     // ---- UNIQUE violations (anchor: "already has the value") ----
     (
         "error.unique.insert.headline",