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>

cmd/bd/mol.go

@@ -66,12 +66,14 @@ See also:
 // This instantiates a proto (template) into a molecule (real issues).
 // Wraps cloneSubgraph from template.go and returns InstantiateResult.
 // If ephemeral is true, spawned issues are marked for bulk deletion when closed.
-func spawnMolecule(ctx context.Context, s storage.Storage, subgraph *MoleculeSubgraph, vars map[string]string, assignee string, actorName string, ephemeral bool) (*InstantiateResult, error) {
+// The prefix parameter overrides the default issue prefix (bd-hobo: distinct prefixes).
+func spawnMolecule(ctx context.Context, s storage.Storage, subgraph *MoleculeSubgraph, vars map[string]string, assignee string, actorName string, ephemeral bool, prefix string) (*InstantiateResult, error) {
 	opts := CloneOptions{
 		Vars:     vars,
 		Assignee: assignee,
 		Actor:    actorName,
 		Wisp:     ephemeral,
+		Prefix:   prefix,
 	}
 	return cloneSubgraph(ctx, s, subgraph, opts)
 }