Q-W4: split actions.cpp into design_view_actions/bank_actions/prune_action + shared action_registry; bank verbs deduped into promptless bankOp* inner verbs in panel_bank_ops (one mutation home, two UX skins); command-id strings byte-identical; actions.h shim carrier retired

src/shell/actions/action_registry.h

@@ -0,0 +1,29 @@
+#pragma once
+// action_registry — shared registration plumbing for the bindable action families
+// (Q-W4 split of actions.cpp). Owns the durable interned-string store both the
+// Design View and multi-bank families register through, so a composed command id
+// keeps ONE stable pointer from register to the mirror-unregister, and the
+// register-a-command_id-then-gaccel sequence has one implementation.
+//
+// Includes reaper_plugin.h (gaccel_register_t / reaper_plugin_info_t full defs);
+// only the action-family TUs include this header. Q-W6's registration table
+// subsumes this helper when the hand-written blocks become data.
+
+#include "reaper_plugin.h"  // reaper_plugin_info_t, gaccel_register_t
+
+namespace reasampler {
+
+// Returns the channel-qualified command id for `suffix`, interning it once for the
+// process lifetime. Called by BOTH registerAction and each family's unregister path,
+// so a '-command_id' presents the IDENTICAL string pointer registered earlier.
+const char* channelIdFor(const char* suffix);
+
+// Mints a command id from a channel-qualified SUFFIX and registers its gaccel
+// (Actions-list entry with a channel-qualified label PHRASE). Returns the command id
+// (0 on failure). Both the composed id and label are interned durably — REAPER holds
+// the desc pointer, and the id must survive to the mirror-unregister. The gaccel
+// storage itself is caller-owned (file-scope in the family TU).
+int registerAction(reaper_plugin_info_t* rec, const char* suffix,
+                   gaccel_register_t& accel, const char* phrase);
+
+}  // namespace reasampler