feat(cli): --version/-V + in-app version command + release guard (ADR-0054)

Cargo.toml version is the single source of truth, surfaced by a
--version/-V CLI flag and an in-app `version` command (both via
cli::version_text -> cli.version_line). release.yaml gains a guard that
fails the release unless the v* tag equals v<CARGO_PKG_VERSION>, keeping
--version, the release name, and the asset in lockstep. New app command
wired across grammar/REGISTRY/dispatch/usage/help/hint-corpus/keys; 6
test-first tests. Also fixes a stale "macOS deferred" comment in
release.yaml. ADR-0054 + README index + plan-doc step 1.

src/friendly/keys.rs

@@ -181,6 +181,7 @@ pub const KEYS_AND_PLACEHOLDERS: &[(&str, &[&str])] = &[
     ("help.app.quit", &[]),
     ("help.app.help", &[]),
     ("help.app.hint", &[]),
+    ("help.app.version", &[]),
     ("help.app.rebuild", &[]),
     ("help.app.save", &[]),
     ("help.app.new", &[]),
@@ -272,6 +273,8 @@ pub const KEYS_AND_PLACEHOLDERS: &[(&str, &[&str])] = &[
     ("hint.cmd.help.concept", &[]),
     ("hint.cmd.hint.what", &[]),
     ("hint.cmd.hint.example", &[]),
+    ("hint.cmd.version.what", &[]),
+    ("hint.cmd.version.example", &[]),
     ("hint.cmd.rebuild.what", &[]),
     ("hint.cmd.rebuild.example", &[]),
     ("hint.cmd.rebuild.concept", &[]),
@@ -486,6 +489,7 @@ pub const KEYS_AND_PLACEHOLDERS: &[(&str, &[&str])] = &[
     ("parse.usage.mode", &[]),
     ("parse.usage.new", &[]),
     ("parse.usage.quit", &[]),
+    ("parse.usage.version", &[]),
     ("parse.usage.rebuild", &[]),
     ("parse.usage.redo", &[]),
     ("parse.usage.replay", &[]),
@@ -580,6 +584,7 @@ pub const KEYS_AND_PLACEHOLDERS: &[(&str, &[&str])] = &[
     ("cli.multiple_paths", &["first", "second"]),
     ("cli.resume_with_path", &[]),
     ("cli.unknown_argument", &["arg"]),
+    ("cli.version_line", &["version"]),
     (
         "archive.export_sequence_exhausted",
         &["project", "target_dir", "limit"],