chore: remove issue ID references from comments

Strip (gt-xxx), (bd-xxx) suffixes from code comments. The descriptions
remain meaningful without the ephemeral issue IDs.

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

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

internal/beads/beads.go

@@ -286,7 +286,7 @@ func (b *Beads) Ready() ([]*Issue, error) {
 }
 
 // ReadyWithType returns ready issues filtered by type.
-// Uses bd ready --type flag for server-side filtering (gt-ktf3).
+// Uses bd ready --type flag for server-side filtering.
 func (b *Beads) ReadyWithType(issueType string) ([]*Issue, error) {
 	out, err := b.run("ready", "--json", "--type", issueType, "-n", "100")
 	if err != nil {