feat: Distinct prefixes for protos, molecules, wisps (bd-hobo)

Added type-specific ID prefixes for better visual recognition:
- `bd pour` now generates IDs with "mol-" prefix
- `bd wisp create` now generates IDs with "wisp-" prefix
- Regular issues continue using the configured prefix

Implementation:
- Added IDPrefix field to types.Issue (internal, not exported to JSONL)
- Added Prefix field to CloneOptions for spawning operations
- Added IDPrefix to RPC CreateArgs for daemon communication
- Updated storage layer to use issue.IDPrefix when generating IDs
- Updated pour.go and wisp.go to pass appropriate prefixes

This enables instant visual recognition of entity types and prevents
accidental modification of templates.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

internal/rpc/protocol.go

@@ -89,6 +89,8 @@ type CreateArgs struct {
 	Sender string `json:"sender,omitempty"` // Who sent this (for messages)
 	Wisp   bool   `json:"wisp,omitempty"`   // Wisp = ephemeral vapor from the Steam Engine; bulk-deleted when closed
 	RepliesTo string `json:"replies_to,omitempty"` // Issue ID for conversation threading
+	// ID generation (bd-hobo)
+	IDPrefix string `json:"id_prefix,omitempty"` // Override prefix for ID generation (mol, wisp, etc.)
 }
 
 // UpdateArgs represents arguments for the update operation

internal/rpc/server_issues_epics.go

@@ -179,6 +179,8 @@ func (s *Server) handleCreate(req *Request) Response {
 		Sender: createArgs.Sender,
 		Wisp:   createArgs.Wisp,
 		// NOTE: RepliesTo now handled via replies-to dependency (Decision 004)
+		// ID generation (bd-hobo)
+		IDPrefix: createArgs.IDPrefix,
 	}
 	
 	// Check if any dependencies are discovered-from type