feat(M3): edit+rerun schema substrate — stage_inputs store, stale/human_modified columns, db 1.3.0

- Pipeline_Schema_Installer: run_stages gains human_modified + stale
  (stale is a COLUMN not a status: rows stay 'done' so resume code can
  never silently re-run them — CPO guardrail 3 by construction);
  run_decisions gains human_modified; new INSERT-only stage_inputs table
  (edit forks as immutable versions + idea seeds for re-run-from-here).
  All dbDelta-idempotent; PRAUTOBLOGGER_DB_VERSION 1.1.0 -> 1.3.0 (the
  constant never carried the documented 1.2.0) so the existing
  admin_init/cron self-healing migration path fires everywhere.
- Run_Stage_State split (M2 pattern, was 313 lines): pipeline write
  bodies moved verbatim to Run_Stage_Writes (public API unchanged via
  thin proxies); done() now clears stale on fresh output with a
  half-migrated-schema retry (Cost_Tracker v0.18.0 pattern); new
  item-scoped read stages_for_item(). Operator-action mutations
  (restart/mark_stale/demote_to_pending) isolated in
  Run_Stage_Rerun_State — the only code allowed to demote a done row.
- Audit_Writer::flag_decisions_human_modified() (guardrail 2 on
  run_decisions). Run_Reaper retention prunes human fork bodies (seeds
  kept). Uninstall covers the new table + rerun cron hooks.

Agent-Session: engineer-prab-m3-20260612

uninstall.php

@@ -37,6 +37,8 @@ $tables = array(
 	$prefix . 'run_decisions',
 	$prefix . 'runs',
 	$prefix . 'run_stages',
+	// Edit + re-run input versions (v0.20.0 / db 1.3.0).
+	$prefix . 'stage_inputs',
 );
 
 foreach ( $tables as $table ) {
@@ -93,6 +95,8 @@ $hooks = array(
 	'prautoblogger_generate_queued_article',
 	'prautoblogger_generate_from_idea',
 	'prautoblogger_opik_dispatch',
+	'prautoblogger_rerun_stage_replay',
+	'prautoblogger_rerun_from_stage',
 );
 
 foreach ( $hooks as $hook ) {