feat: remove Todoist integration entirely

Native tasks (native_tasks table) fully replace Todoist. All Todoist
API code, store functions, handlers, routes, templates, and tests have
been removed. Migration 021 drops the now-unused tasks cache table.

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

2 files changed, 3 insertions, 27 deletions

diff --git a/internal/config/config.go b/internal/config/config.go
index 6d2e2ef..f4baeef 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -9,7 +9,6 @@ import (
 // Config holds all application configuration
 type Config struct {
 	// API Keys
-	TodoistAPIKey     string
 	PlanToEatAPIKey   string
 	PlanToEatSession  string // Session cookie for web scraping
 	TrelloAPIKey      string
@@ -56,7 +55,6 @@ type Config struct {
 func Load() (*Config, error) {
 	cfg := &Config{
 		// API Keys
-		TodoistAPIKey:    os.Getenv("TODOIST_API_KEY"),
 		PlanToEatAPIKey:  os.Getenv("PLANTOEAT_API_KEY"),
 		PlanToEatSession: os.Getenv("PLANTOEAT_SESSION"),
 		TrelloAPIKey:     os.Getenv("TRELLO_API_KEY"),
@@ -109,7 +107,6 @@ func Load() (*Config, error) {
 
 // Validate checks that required configuration is present
 func (c *Config) Validate() error {
-	// Todoist is optional — native task management replaces it when key is absent
 	if c.TrelloAPIKey == "" {
 		return fmt.Errorf("TRELLO_API_KEY is required")
 	}
diff --git a/internal/config/config_test.go b/internal/config/config_test.go
index 0722825..b436e93 100644
--- a/internal/config/config_test.go
+++ b/internal/config/config_test.go
@@ -15,33 +15,22 @@ func TestConfigValidate(t *testing.T) {
 		{
 			name: "valid config",
 			cfg: Config{
-				TodoistAPIKey: "todoist-key",
-				TrelloAPIKey:  "trello-key",
-				TrelloToken:   "trello-token",
-			},
-			wantErr: false,
-		},
-		{
-			name: "missing todoist key",
-			cfg: Config{
 				TrelloAPIKey: "trello-key",
 				TrelloToken:  "trello-token",
 			},
-			wantErr: true,
+			wantErr: false,
 		},
 		{
 			name: "missing trello key",
 			cfg: Config{
-				TodoistAPIKey: "todoist-key",
-				TrelloToken:   "trello-token",
+				TrelloToken: "trello-token",
 			},
 			wantErr: true,
 		},
 		{
 			name: "missing trello token",
 			cfg: Config{
-				TodoistAPIKey: "todoist-key",
-				TrelloAPIKey:  "trello-key",
+				TrelloAPIKey: "trello-key",
 			},
 			wantErr: true,
 		},
@@ -242,14 +231,12 @@ func TestToDisplayTZ(t *testing.T) {
 
 func TestLoad(t *testing.T) {
 	// Set up required env vars
-	os.Setenv("TODOIST_API_KEY", "test-todoist-key")
 	os.Setenv("TRELLO_API_KEY", "test-trello-key")
 	os.Setenv("TRELLO_TOKEN", "test-trello-token")
 	os.Setenv("PORT", "9999")
 	os.Setenv("CACHE_TTL_MINUTES", "10")
 	os.Setenv("DEBUG", "true")
 	defer func() {
-		os.Unsetenv("TODOIST_API_KEY")
 		os.Unsetenv("TRELLO_API_KEY")
 		os.Unsetenv("TRELLO_TOKEN")
 		os.Unsetenv("PORT")
@@ -262,9 +249,6 @@ func TestLoad(t *testing.T) {
 		t.Fatalf("Load failed: %v", err)
 	}
 
-	if cfg.TodoistAPIKey != "test-todoist-key" {
-		t.Errorf("Expected TodoistAPIKey 'test-todoist-key', got '%s'", cfg.TodoistAPIKey)
-	}
 	if cfg.Port != "9999" {
 		t.Errorf("Expected Port '9999', got '%s'", cfg.Port)
 	}
@@ -278,11 +262,9 @@ func TestLoad(t *testing.T) {
 
 func TestConfig_ClaudomatorURL_Default(t *testing.T) {
 	os.Unsetenv("CLAUDOMATOR_URL")
-	os.Setenv("TODOIST_API_KEY", "test-todoist-key")
 	os.Setenv("TRELLO_API_KEY", "test-trello-key")
 	os.Setenv("TRELLO_TOKEN", "test-trello-token")
 	defer func() {
-		os.Unsetenv("TODOIST_API_KEY")
 		os.Unsetenv("TRELLO_API_KEY")
 		os.Unsetenv("TRELLO_TOKEN")
 	}()
@@ -298,12 +280,10 @@ func TestConfig_ClaudomatorURL_Default(t *testing.T) {
 
 func TestConfig_ClaudomatorURL_EnvOverride(t *testing.T) {
 	os.Setenv("CLAUDOMATOR_URL", "http://1.2.3.4:9000")
-	os.Setenv("TODOIST_API_KEY", "test-todoist-key")
 	os.Setenv("TRELLO_API_KEY", "test-trello-key")
 	os.Setenv("TRELLO_TOKEN", "test-trello-token")
 	defer func() {
 		os.Unsetenv("CLAUDOMATOR_URL")
-		os.Unsetenv("TODOIST_API_KEY")
 		os.Unsetenv("TRELLO_API_KEY")
 		os.Unsetenv("TRELLO_TOKEN")
 	}()
@@ -319,7 +299,6 @@ func TestConfig_ClaudomatorURL_EnvOverride(t *testing.T) {
 
 func TestLoad_ValidationError(t *testing.T) {
 	// Clear required env vars to trigger validation error
-	os.Unsetenv("TODOIST_API_KEY")
 	os.Unsetenv("TRELLO_API_KEY")
 	os.Unsetenv("TRELLO_TOKEN")