Fix #274: Add automatic .beads/.gitignore upgrade (#300)

* Fix #274: Add automatic .beads/.gitignore upgrade

Implements three mechanisms to ensure users get updated gitignore:

1. bd doctor --fix: Manually upgrade gitignore
2. Daemon auto-upgrade: Upgrades on startup if outdated
3. bd init idempotent: Safe to re-run, always updates gitignore

The gitignore template now lives in cmd/bd/doctor/gitignore.go
for consistent updates across all three mechanisms.

Fixes: #274

* Remove test binary

Amp-Thread-ID: https://ampcode.com/threads/T-7042cfcc-ac97-43d7-a40f-3fa1bb4e1c2b
Co-authored-by: Amp <amp@ampcode.com>

* Fix critical issues: remove merge artifact and apply gitignore template

- Remove .beads/beads.left.jsonl (merge artifact that shouldn't be committed)
- Apply new gitignore template to .beads/.gitignore (was missing patterns)

Amp-Thread-ID: https://ampcode.com/threads/T-7042cfcc-ac97-43d7-a40f-3fa1bb4e1c2b
Co-authored-by: Amp <amp@ampcode.com>

* bd sync: 2025-11-12 11:09:30

* Retrigger CI

Amp-Thread-ID: https://ampcode.com/threads/T-8d532264-6d5e-4b68-88e9-e4511851b64a
Co-authored-by: Amp <amp@ampcode.com>

* Fix duplicate DoctorCheck type definition

* Trigger CI after fixing type conflict

Amp-Thread-ID: https://ampcode.com/threads/T-8d532264-6d5e-4b68-88e9-e4511851b64a
Co-authored-by: Amp <amp@ampcode.com>

---------

Co-authored-by: Amp <amp@ampcode.com>

cmd/bd/daemon.go

@@ -10,6 +10,7 @@ import (
 	"time"
 
 	"github.com/spf13/cobra"
+	"github.com/steveyegge/beads/cmd/bd/doctor"
 	"github.com/steveyegge/beads/internal/beads"
 	"github.com/steveyegge/beads/internal/daemon"
 	"github.com/steveyegge/beads/internal/rpc"
@@ -308,6 +309,17 @@ func runDaemonLoop(interval time.Duration, autoCommit, autoPush bool, logPath, p
 	defer func() { _ = store.Close() }()
 	log.log("Database opened: %s", daemonDBPath)
 
+	// Auto-upgrade .beads/.gitignore if outdated
+	gitignoreCheck := doctor.CheckGitignore()
+	if gitignoreCheck.Status == "warning" || gitignoreCheck.Status == "error" {
+		log.log("Upgrading .beads/.gitignore...")
+		if err := doctor.FixGitignore(); err != nil {
+			log.log("Warning: failed to upgrade .gitignore: %v", err)
+		} else {
+			log.log("Successfully upgraded .beads/.gitignore")
+		}
+	}
+
 	// Hydrate from multi-repo if configured
 	hydrateCtx := context.Background()
 	if results, err := store.HydrateFromMultiRepo(hydrateCtx); err != nil {