fix(ready): exclude molecule steps from bd ready by default (#1246)

* fix(ready): exclude molecule steps from bd ready by default (GH#1239)

Add ID prefix constants (IDPrefixMol, IDPrefixWisp) to types.go as single
source of truth. Update pour.go and wisp.go to use these constants.

GetReadyWork now excludes issues with -mol- in their ID when no explicit
type filter is specified. Users can still see mol steps with --type=task.

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

* feat(ready): config-driven ID pattern exclusion (GH#1239)

Add ready.exclude_id_patterns config for excluding IDs from bd ready.
Default patterns: -mol-, -wisp- (molecule steps and wisps).

Changes:
- Add IncludeMolSteps to WorkFilter for internal callers
- Update findGateReadyMolecules and getMoleculeCurrentStep to use it
- Make exclusion patterns config-driven via ready.exclude_id_patterns
- Remove hardcoded MolStepIDPattern() in favor of config
- Add test for custom patterns (e.g., gastown's -role-)

Usage: bd config set ready.exclude_id_patterns "-mol-,-wisp-,-role-"

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

* docs: remove -role- example from ready.go comments

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

* docs: remove GH#1239 references from code comments

Issue references belong in commit messages, not code.

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

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

cmd/bd/mol_ready_gated.go

@@ -131,7 +131,8 @@ func findGateReadyMolecules(ctx context.Context, s storage.Storage) ([]*GatedMol
 	}
 
 	// Step 2: Get ready work to check which steps are ready
-	readyIssues, err := s.GetReadyWork(ctx, types.WorkFilter{Limit: 500})
+	// IncludeMolSteps: true because we specifically need to see molecule steps here
+	readyIssues, err := s.GetReadyWork(ctx, types.WorkFilter{Limit: 500, IncludeMolSteps: true})
 	if err != nil {
 		return nil, fmt.Errorf("getting ready work: %w", err)
 	}