feat(v0.7.0): public knowledge — collaborative intelligence across human-Claude pairs

Enable any human-Claude pair to publish verified knowledge that all other
pairs can discover, review, and build upon — forming an emergent mesh of
shared understanding across independent collaborations.

Three-gate safety: explicit opt-in → harm/safety verification → 15-min
standby timer. Content graduates from pending_public to public only after
the standby window, then exports via bridge_push with automatic GitHub
releases for discoverability.

New MCP tools: request_publish, cancel_publish, search_public_knowledge.
Schema: visibility + publish_requested_at on entities & tasks (6 migrations).
Bridge: standby promotion, public_knowledge export/import, release creation.
Task Tray: Publish/Unpublish context menu with dual QMessageBox warnings,
⏳/🌐 visibility badges, sync integration.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: RMANOV

db_utils.py

@@ -34,6 +34,10 @@
 TASK_HIDDEN_STATUSES = ("archived", "cancelled")
 TASK_ACTIVE_EXCLUSIONS = ("done", "archived", "cancelled")
 
+# v0.7.0: Public knowledge visibility
+VISIBILITY_LEVELS = ("private", "pending_public", "public")
+PUBLISH_STANDBY_MINUTES = 15
+
 # Collaboration constants
 TRUST_LEVELS = ("read_only", "read_write")
 SHARE_TYPES = ("entity", "relation", "all")
@@ -64,6 +68,8 @@
         "assignee",
         "shared_by",
         "updated_at",
+        "visibility",
+        "publish_requested_at",
     }
 )