Add beads and gastown to CI cache, consolidate CI workflow

- Add packages/beads and packages/gastown with shared definitions
- Expose custom-beads and custom-gastown in flake packages output
- Consolidate CI from matrix (8 parallel jobs) to single job with loop
- Saves ~12 minutes of redundant nix-setup time per run
- Uses ::group:: for collapsible log sections per package

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

packages/beads/default.nix

@@ -0,0 +1,41 @@
+# Beads package - issue tracker for AI-supervised coding workflows
+# Takes src as argument so it can be called from both overlay and flake packages
+{ lib
+, stdenv
+, buildGoModule
+, fetchurl
+, go_1_25
+, git
+, pkg-config
+, icu
+, src
+, version ? "unknown"
+}:
+
+let
+  # nixpkgs ships Go 1.25.5, but beads' dolt deps require Go >= 1.25.6
+  go_1_25_6 = go_1_25.overrideAttrs (old: rec {
+    version = "1.25.6";
+    src = fetchurl {
+      url = "https://go.dev/dl/go${version}.src.tar.gz";
+      hash = "sha256-WMv3ceRNdt5vVtGeM7d9dFoeSJNAkih15GWFuXXCsFk=";
+    };
+  });
+  buildGoModule_1_25_6 = buildGoModule.override { go = go_1_25_6; };
+in
+buildGoModule_1_25_6 {
+  pname = "beads";
+  inherit version src;
+  subPackages = [ "cmd/bd" ];
+  doCheck = false;
+  # Regenerated vendorHash for commit 6a51223b (dolt server mode, Go 1.25.6)
+  vendorHash = "sha256-9RMy0+ZBFg1BAl8Z0EuZK4XVm9QYVekS9i/1ErOIB/c=";
+  nativeBuildInputs = [ git pkg-config ];
+  buildInputs = [ icu ];
+  meta = with lib; {
+    description = "beads (bd) - An issue tracker designed for AI-supervised coding workflows";
+    homepage = "https://github.com/steveyegge/beads";
+    license = licenses.mit;
+    mainProgram = "bd";
+  };
+}

packages/gastown/default.nix

@@ -0,0 +1,38 @@
+# Gastown package - multi-agent workspace manager
+# Takes src as argument so it can be called from both overlay and flake packages
+{ lib
+, buildGoModule
+, src
+, version ? "unknown"
+}:
+
+buildGoModule {
+  pname = "gastown";
+  inherit version src;
+  vendorHash = "sha256-ripY9vrYgVW8bngAyMLh0LkU/Xx1UUaLgmAA7/EmWQU=";
+  subPackages = [ "cmd/gt" ];
+  doCheck = false;
+
+  # Must match ldflags from gastown Makefile - BuiltProperly=1 is required
+  # or gt will error with "This binary was built with 'go build' directly"
+  ldflags = [
+    "-X github.com/steveyegge/gastown/internal/cmd.Version=${version}"
+    "-X github.com/steveyegge/gastown/internal/cmd.Commit=${version}"
+    "-X github.com/steveyegge/gastown/internal/cmd.BuildTime=nix-build"
+    "-X github.com/steveyegge/gastown/internal/cmd.BuiltProperly=1"
+  ];
+
+  # Bug fixes not yet merged upstream
+  patches = [
+    ./gastown-fix-validate-recipient.patch
+    ./gastown-fix-agent-bead-address-title.patch
+    ./gastown-statusline-optimization.patch
+  ];
+
+  meta = with lib; {
+    description = "Gas Town - multi-agent workspace manager by Steve Yegge";
+    homepage = "https://github.com/steveyegge/gastown";
+    license = licenses.mit;
+    mainProgram = "gt";
+  };
+}

packages/gastown/gastown-fix-agent-bead-address-title.patch

@@ -0,0 +1,15 @@
+diff --git a/internal/mail/router.go b/internal/mail/router.go
+--- a/internal/mail/router.go
++++ b/internal/mail/router.go
+@@ -315,7 +315,10 @@ func agentBeadToAddress(bead *agentBead) string {
+ 		}
+
+ 		// For other hq- agents, fall back to description parsing
+-		return parseAgentAddressFromDescription(bead.Description)
++		if bead.Title != "" && strings.Contains(bead.Title, "/") {
++			return bead.Title
++		}
++		return parseAgentAddressFromDescription(bead.Description)
+ 	}
+
+ 	// Handle gt- prefixed IDs (legacy format)

packages/gastown/gastown-fix-validate-recipient.patch

@@ -0,0 +1,13 @@
+diff --git a/internal/mail/router.go b/internal/mail/router.go
+index b864c069..4b6a045b 100644
+--- a/internal/mail/router.go
++++ b/internal/mail/router.go
+@@ -646,7 +646,7 @@ func (r *Router) validateRecipient(identity string) error {
+ 	}
+ 
+ 	for _, agent := range agents {
+-		if agentBeadToAddress(agent) == identity {
++		if AddressToIdentity(agentBeadToAddress(agent)) == AddressToIdentity(identity) {
+ 			return nil // Found matching agent
+ 		}
+ 	}

packages/gastown/gastown-statusline-optimization.patch

@@ -0,0 +1,135 @@
+diff --git a/internal/cmd/statusline.go b/internal/cmd/statusline.go
+index 2edf1be8..00253eea 100644
+--- a/internal/cmd/statusline.go
++++ b/internal/cmd/statusline.go
+@@ -6,6 +6,7 @@ import (
+ 	"path/filepath"
+ 	"sort"
+ 	"strings"
++	"time"
+ 
+ 	"github.com/spf13/cobra"
+ 	"github.com/steveyegge/gastown/internal/beads"
+@@ -14,6 +15,37 @@ import (
+ 	"github.com/steveyegge/gastown/internal/tmux"
+ 	"github.com/steveyegge/gastown/internal/workspace"
+ )
++// statusLineCacheTTL is how long cached status output remains valid.
++const statusLineCacheTTL = 10 * time.Second
++
++// statusLineCachePath returns the cache file path for a session.
++func statusLineCachePath(session string) string {
++	return filepath.Join(os.TempDir(), fmt.Sprintf("gt-status-%s", session))
++}
++
++// getStatusLineCache returns cached status if fresh, empty string otherwise.
++func getStatusLineCache(session string) string {
++	path := statusLineCachePath(session)
++	info, err := os.Stat(path)
++	if err != nil {
++		return ""
++	}
++	if time.Since(info.ModTime()) > statusLineCacheTTL {
++		return ""
++	}
++	data, err := os.ReadFile(path)
++	if err != nil {
++		return ""
++	}
++	return string(data)
++}
++
++// setStatusLineCache writes status to cache file.
++func setStatusLineCache(session, status string) {
++	path := statusLineCachePath(session)
++	_ = os.WriteFile(path, []byte(status), 0644)
++}
++
+ 
+ var (
+ 	statusLineSession string
+@@ -34,6 +66,19 @@ func init() {
+ func runStatusLine(cmd *cobra.Command, args []string) error {
+ 	t := tmux.NewTmux()
+ 
++	// Optimization: skip expensive beads queries for detached sessions
++	if statusLineSession != "" {
++		if !t.IsSessionAttached(statusLineSession) {
++			fmt.Print("○ |")
++			return nil
++		}
++		// Check cache for attached sessions too
++		if cached := getStatusLineCache(statusLineSession); cached != "" {
++			fmt.Print(cached)
++			return nil
++		}
++	}
++
+ 	// Get session environment
+ 	var rigName, polecat, crew, issue, role string
+ 
+@@ -150,7 +195,11 @@ func runWorkerStatusLine(t *tmux.Tmux, session, rigName, polecat, crew, issue st
+ 
+ 	// Output
+ 	if len(parts) > 0 {
+-		fmt.Print(strings.Join(parts, " | ") + " |")
++		output := strings.Join(parts, " | ") + " |"
++		if statusLineSession != "" {
++			setStatusLineCache(statusLineSession, output)
++		}
++		fmt.Print(output)
+ 	}
+ 
+ 	return nil
+@@ -389,7 +438,11 @@ func runMayorStatusLine(t *tmux.Tmux) error {
+ 		}
+ 	}
+ 
+-	fmt.Print(strings.Join(parts, " | ") + " |")
++	output := strings.Join(parts, " | ") + " |"
++	if statusLineSession != "" {
++		setStatusLineCache(statusLineSession, output)
++	}
++	fmt.Print(output)
+ 	return nil
+ }
+ 
+@@ -458,7 +511,11 @@ func runDeaconStatusLine(t *tmux.Tmux) error {
+ 		}
+ 	}
+ 
+-	fmt.Print(strings.Join(parts, " | ") + " |")
++	output := strings.Join(parts, " | ") + " |"
++	if statusLineSession != "" {
++		setStatusLineCache(statusLineSession, output)
++	}
++	fmt.Print(output)
+ 	return nil
+ }
+ 
+@@ -526,7 +583,11 @@ func runWitnessStatusLine(t *tmux.Tmux, rigName string) error {
+ 		}
+ 	}
+ 
+-	fmt.Print(strings.Join(parts, " | ") + " |")
++	output := strings.Join(parts, " | ") + " |"
++	if statusLineSession != "" {
++		setStatusLineCache(statusLineSession, output)
++	}
++	fmt.Print(output)
+ 	return nil
+ }
+ 
+@@ -617,7 +678,11 @@ func runRefineryStatusLine(t *tmux.Tmux, rigName string) error {
+ 		}
+ 	}
+ 
+-	fmt.Print(strings.Join(parts, " | ") + " |")
++	output := strings.Join(parts, " | ") + " |"
++	if statusLineSession != "" {
++		setStatusLineCache(statusLineSession, output)
++	}
++	fmt.Print(output)
+ 	return nil
+ }
+