fix: parliament UX, prompt alignment, execution nudges (0.9.14)

Inject shared parliament context into the agent environment, switch
prompts away from in-process workers when parliament is active, clear
login tickets on chair sync/new-project, and surface realm/chair/service
in /status. Tighten empty-reply handling and prefer-tool principles.

Co-authored-by: Cursor <cursoragent@cursor.com>

include/cst_parliament.h

@@ -40,6 +40,12 @@ char *cst_parliament_device_context(void);
 /* New project: wipe shared parliament context; keep Realm keys. */
 int cst_parliament_new_project(const char *project_id);
 
+/* Resolve collaboration mode: env CST_COLLABORATION, then settings,
+ * then password-Realm with an open parliament → "parliament". */
+int cst_parliament_is_active(void);
+/* Short status lines for TUI/CLI (malloc'd; caller frees). */
+char *cst_parliament_status_text(void);
+
 /* Append/replace synchronized context blob (all agents share this file). */
 int cst_parliament_context_put(const char *text);
 char *cst_parliament_context_get(void);