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>

internal/storage/sqlite/test_helpers.go

@@ -149,6 +149,23 @@ func (e *testEnv) AssertBlocked(issue *types.Issue) {
 	}
 }
 
+// CreateIssueWithID creates a test issue with an explicit ID.
+// Useful for testing ID-based filtering (e.g., mol step exclusion).
+func (e *testEnv) CreateIssueWithID(id, title string) *types.Issue {
+	e.t.Helper()
+	issue := &types.Issue{
+		ID:        id,
+		Title:     title,
+		Status:    types.StatusOpen,
+		Priority:  2,
+		IssueType: types.TypeTask,
+	}
+	if err := e.Store.CreateIssue(e.Ctx, issue, "test-user"); err != nil {
+		e.t.Fatalf("CreateIssue(%q, %q) failed: %v", id, title, err)
+	}
+	return issue
+}
+
 // newTestStore creates a SQLiteStorage with issue_prefix configured (bd-166)
 // This prevents "database not initialized" errors in tests
 //