docs(control): name the pre-ledger versions the guard meets

The current in-place schema moves are SQLite v4 / Postgres v5 (#365), but
the ledger refusal and the `--adopt-baseline` help text still said v3/v4 —
an operator reading the refusal would look for the wrong build. The
foreign-store refusal also named a `preloop store import` command that does
not exist; the command is `preloop store import-legacy`, as
docs/control-migrations.md and the legacy-store refusal already say.

Author: Preloop Agent

crates/preloop-cli/src/store.rs

@@ -33,8 +33,9 @@ struct MigrateArgs {
     store: Option<String>,
 
     /// Adopt a pre-ledger control database after verifying its shape
-    /// (unreleased v3/v4 builds), then apply pending migrations. Refused
-    /// unless the database's structure is exactly a known migration point.
+    /// (an unreleased build: SQLite v4 / Postgres v5), then apply pending
+    /// migrations. Refused unless the database's structure is exactly a
+    /// known migration point.
     #[arg(long)]
     adopt_baseline: bool,
 

crates/preloop-runner-server/src/control/migrations.rs

@@ -53,12 +53,13 @@ pub(crate) fn refusal(ledger: Ledger) -> String {
             .to_owned(),
         Ledger::Foreign => "control database holds tables but no control schema; refusing to \
              initialize over existing state. Point the server at a dedicated control database, \
-             or import (`preloop store import`, docs/control-migrations.md)."
+             or import a legacy store (`preloop store import-legacy`, docs/control-migrations.md)."
             .to_owned(),
         Ledger::Unledgered => "control database has a control schema but no \
-             `refinery_schema_history` ledger: it predates tracked migrations (unreleased v3/v4 \
-             builds). Adopt it explicitly with `preloop store migrate --adopt-baseline`, which \
-             verifies the schema first, or recreate/import; the server never adopts it silently."
+             `refinery_schema_history` ledger: it predates tracked migrations (an unreleased \
+             pre-ledger build: SQLite v4 / Postgres v5). Adopt it explicitly with \
+             `preloop store migrate --adopt-baseline`, which verifies the schema first, or \
+             recreate/import; the server never adopts it silently."
             .to_owned(),
         Ledger::MissingMeta => "control database has a migration ledger but no `schema_meta` \
              table: the schema is incomplete (a partial create or manual surgery). Restore the \

crates/preloop-runner-server/src/store_admin.rs

@@ -66,7 +66,8 @@ impl StoreTarget {
 #[derive(Debug, Clone)]
 pub struct MigrateOptions {
     /// Adopt a pre-ledger control database after verifying its shape
-    /// (unreleased v3/v4 builds), then apply the pending migrations.
+    /// (an unreleased build: SQLite v4 / Postgres v5), then apply the
+    /// pending migrations.
     pub adopt_baseline: bool,
     /// Take the pre-migration SQLite backup (default on; set false to skip).
     pub backup: bool,