feat: comprehensive INFO/WARN/ERROR logging across all controller modules

Add structured operational logging at INFO, WARN, and ERROR levels to
every controller module. Standardize custom prefixes ([GEO], [SCHED],
[SYNC]) to use [INFO/WARN/ERROR] [module] format. Fix misleveled logs
(WARN->ERROR for data loss scenarios, WARN->INFO for routine operations).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

controller/internal/stacks/delete.go

@@ -4,6 +4,7 @@ import (
 	"bufio"
 	"context"
 	"fmt"
+	"log"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -557,6 +558,7 @@ func ParseComposeHDDMounts(composePath, hddPath string) []string {
 		}
 	}
 
+	log.Printf("[INFO] [stacks] ParseComposeHDDMounts: found %d HDD mounts for %s", len(mounts), composePath)
 	return mounts
 }
 

controller/internal/stacks/deploy.go

@@ -375,6 +375,7 @@ func (m *Manager) runComposeDeploy(name, stackDir string, env map[string]string,
 
 // UpdateStackConfig updates non-locked fields for a deployed stack.
 func (m *Manager) UpdateStackConfig(name string, values map[string]string) error {
+	m.logger.Printf("[INFO] [stacks] Updating config for stack %s", name)
 	if m.isDebug() {
 		m.logger.Printf("[DEBUG] [stacks] UpdateStackConfig called: name=%q, %d values to update", name, len(values))
 	}
@@ -457,6 +458,7 @@ func (m *Manager) GetDeployFields(name string) (*Metadata, *AppConfig, error) {
 // UpdateOptionalConfig updates optional env vars in app.yaml and restarts the stack if deployed.
 // Only updates env vars that are listed in the metadata's optional_config sections.
 func (m *Manager) UpdateOptionalConfig(stackName string, values map[string]string) error {
+	m.logger.Printf("[INFO] [stacks] Updating optional config for stack %s", stackName)
 	if m.isDebug() {
 		m.logger.Printf("[DEBUG] [stacks] UpdateOptionalConfig called: stack=%q, %d values provided", stackName, len(values))
 	}
@@ -588,6 +590,7 @@ func LoadAppConfig(stackDir string) *AppConfig {
 	}
 	cfg := &AppConfig{}
 	if err := yaml.Unmarshal(data, cfg); err != nil {
+		log.Printf("[WARN] [stacks] LoadAppConfig: %v", err)
 		log.Printf("[DEBUG] [stacks] LoadAppConfig: failed to parse %s: %v", path, err)
 		return nil
 	}
@@ -626,6 +629,7 @@ func SaveAppConfig(stackDir string, cfg *AppConfig, encKey []byte, sensitiveVars
 
 	data, err := yaml.Marshal(saveCfg)
 	if err != nil {
+		log.Printf("[ERROR] [stacks] SaveAppConfig: failed to marshal config for %s: %v", stackDir, err)
 		return fmt.Errorf("marshaling app config: %w", err)
 	}
 	path := filepath.Join(stackDir, "app.yaml")
@@ -635,12 +639,15 @@ func SaveAppConfig(stackDir string, cfg *AppConfig, encKey []byte, sensitiveVars
 	// Atomic write: write to .tmp then rename (H04 fix)
 	tmpPath := path + ".tmp"
 	if err := os.WriteFile(tmpPath, []byte(content), 0600); err != nil {
+		log.Printf("[ERROR] [stacks] SaveAppConfig: failed to save %s: %v", path, err)
 		return fmt.Errorf("writing %s: %w", tmpPath, err)
 	}
 	if err := os.Rename(tmpPath, path); err != nil {
 		_ = os.Remove(tmpPath)
+		log.Printf("[ERROR] [stacks] SaveAppConfig: failed to save %s: %v", path, err)
 		return fmt.Errorf("renaming %s to %s: %w", tmpPath, path, err)
 	}
+	log.Printf("[INFO] [stacks] SaveAppConfig: saved config for %s", filepath.Base(stackDir))
 	return nil
 }
 
@@ -724,11 +731,13 @@ func (m *Manager) InjectMissingFields(stackNames []string) {
 		m.logger.Printf("[DEBUG] [stacks] InjectMissingFields: checking %d stacks", len(stackNames))
 	}
 
+	count := 0
 	for _, name := range stackNames {
 		stack, ok := m.GetStack(name)
 		if !ok {
 			continue
 		}
+		count++
 
 		stackDir := filepath.Dir(stack.ComposePath)
 		meta := LoadMetadata(stackDir)
@@ -804,6 +813,7 @@ func (m *Manager) InjectMissingFields(stackNames []string) {
 			m.logger.Printf("[SYNC] Stack %s: injected missing fields: %s", name, strings.Join(injected, ", "))
 		}
 	}
+	m.logger.Printf("[INFO] [stacks] InjectMissingFields: processed %d stacks", count)
 }
 
 func containsStr(slice []string, s string) bool {

controller/internal/stacks/healthprobe.go

@@ -126,9 +126,9 @@ func (m *Manager) RunHealthProbes() error {
 
 	// Summary log
 	if failCount > 0 {
-		m.logger.Printf("[INFO] Health probes: %d ok, %d unhealthy (of %d probed)", okCount, failCount, len(targets))
-	} else if m.isDebug() {
-		m.logger.Printf("[DEBUG] Health probes: %d ok (of %d probed)", okCount, len(targets))
+		m.logger.Printf("[WARN] Health probes: %d ok, %d unhealthy (of %d probed)", okCount, failCount, len(targets))
+	} else {
+		m.logger.Printf("[INFO] Health probes: %d ok (of %d probed)", okCount, len(targets))
 	}
 
 	return nil

controller/internal/stacks/manager.go

@@ -184,6 +184,8 @@ func (m *Manager) MigrateEncryption() {
 	}
 	if migrated > 0 {
 		m.logger.Printf("[INFO] Encrypted sensitive values in %d app.yaml file(s)", migrated)
+	} else {
+		m.logger.Printf("[INFO] [stacks] Encryption migration: no stacks needed migration")
 	}
 }
 
@@ -326,6 +328,7 @@ func (m *Manager) ScanStacks() error {
 	}
 	m.logger.Printf("[INFO] Scanned stacks: %d found (%d deployed, %d available)",
 		len(m.stacks), deployedCount, len(m.stacks)-deployedCount)
+	m.logger.Printf("[INFO] [stacks] ScanStacks complete: %d stacks found", len(m.stacks))
 	return m.refreshStatusLocked()
 }
 
@@ -370,6 +373,8 @@ func (m *Manager) refreshStatusLocked() error {
 		m.logger.Printf("[DEBUG] [stacks] refreshStatusLocked: docker ps returned %d containers across %d projects", totalContainers, len(projectContainers))
 	}
 
+	m.logger.Printf("[INFO] [stacks] Status refresh: %d containers across %d stacks", totalContainers, len(m.stacks))
+
 	for name, stack := range m.stacks {
 		containers, exists := projectContainers[name]
 		if !exists {
@@ -759,6 +764,7 @@ func (m *Manager) GetLogs(name string, lines int) (string, error) {
 		lines = 1000
 	}
 
+	m.logger.Printf("[INFO] [stacks] Fetching logs for stack %s (tail=%d)", name, lines)
 	m.logger.Printf("[DEBUG] Fetching logs for %s (tail %d)", name, lines)
 
 	dir := filepath.Dir(stack.ComposePath)

controller/internal/stacks/metadata.go

@@ -1,7 +1,7 @@
 package stacks
 
 import (
-	"fmt"
+	"log"
 	"os"
 	"path/filepath"
 	"strings"
@@ -126,7 +126,7 @@ func LoadMetadata(stackDir string) Metadata {
 	}
 
 	if err := yaml.Unmarshal(data, &meta); err != nil {
-		fmt.Fprintf(os.Stderr, "[ERROR] Failed to parse .felhom.yml in %s: %v\n", stackDir, err)
+		log.Printf("[ERROR] [stacks] Failed to parse .felhom.yml in %s: %v", stackDir, err)
 		dirName := filepath.Base(stackDir)
 		meta.DisplayName = toTitleCase(strings.ReplaceAll(dirName, "-", " "))
 		meta.Slug = dirName