wipe: one command empties the box and leaves it standing (V-494)

There was no documented way to repair a poisoned box. Two invented facts
written during QA disabled world answering for every later turn (V-470), and
revert voids the SQL row while leaving the vector behind (V-493). This is the
operation that undoes both.

Store.Wipe drops every table sqlite_master reports and rebuilds from schema.sql
plus the migrations, rather than deleting from a hand-written list. A list has
to be edited whenever a table is added, and the once it is not, the wipe leaves
personal data behind while reporting success. It vacuums afterwards, because
free pages still hold readable text.

mavend -wipe prints every table and its row count and exits. That alone is a
dry run and answers what a QA session actually asks: what is on this box. It
deletes only with -confirm-wipe. Two flags, because the destructive reading of
one flag is the reading a mistyped command gets.

Nothing outside the database moves. Config, models, passkeys.json and the
encryption key are files.

QA isolation and onboarding are the other two thirds of V-494 and are not here.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SoL7EBdYC5Mhz3DJd49GJy

cmd/mavend/main.go

@@ -128,6 +128,8 @@ func run(args []string) error {
 	wrappedKeyPath := flag.String("wrapped-key-file", "", "path to wrapped encryption key blob (enables cold-start unlock)")
 	reembed := flag.Bool("reembed", false, "re-embed every stored note and fact with the configured embedder, then serve normally (run once after an embedder swap; the daemon does not answer until it finishes)")
 	allowSeed := flag.Bool("allow-seed", false, "enable the backdated seed_event write path (QA only: it lets a caller place a fact in the past and mint a routine the tick loop will then act on; off means the method has nothing to write with)")
+	wipe := flag.Bool("wipe", false, "print every table and its row count, then exit without serving; add -confirm-wipe to delete all of it")
+	confirmWipe := flag.Bool("confirm-wipe", false, "with -wipe, actually remove every piece of personal data (facts, notes, vectors, events, tasks, sessions, traces, voiceprints). config, models, passkeys and the encryption key are files and survive")
 	flag.CommandLine.Parse(args)
 	reembedOnStart = *reembed
 	allowSeedOnStart = *allowSeed
@@ -210,6 +212,14 @@ func run(args []string) error {
 		}()
 	}
 
+	// ----- wipe: never serves, exits when it is done (Vikunja #494) -----
+	if *wipe {
+		if locked {
+			return fmt.Errorf("wipe: the store is locked and there is no key to open it with")
+		}
+		return runWipe(ctx, st, os.Stdout, *confirmWipe)
+	}
+
 	// ----- daemon components (only wired when unlocked) -----
 	// Pre-declare so the unlock path can wire them later.
 	var (