fix(config): clear deprecated Enabled field after env overrides

applyEnvOverrides repopulates Extraction.Enabled from
MICASA_EXTRACTION_ENABLED after migrateRenamedKeys already cleared it.
Clear it again post-env-overrides so both fields never coexist in the
resolved config.

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

Author: cpcloud

internal/config/config.go

@@ -388,6 +388,15 @@ func LoadFromPath(path string) (Config, error) {
 		return cfg, err
 	}
 
+	// Clear deprecated Enabled again: applyEnvOverrides may have
+	// repopulated it from MICASA_EXTRACTION_ENABLED.
+	if cfg.Extraction.Enabled != nil {
+		if cfg.Extraction.Enable == nil {
+			cfg.Extraction.Enable = cfg.Extraction.Enabled
+		}
+		cfg.Extraction.Enabled = nil
+	}
+
 	// Normalize base URLs: strip trailing slash and /v1 suffix --
 	// providers handle their own path construction.
 	cfg.LLM.BaseURL = normalizeBaseURL(cfg.LLM.BaseURL)

internal/config/config_test.go

@@ -766,6 +766,7 @@ func TestEnabledEnvMigration(t *testing.T) {
 	cfg, err := LoadFromPath(noConfig(t))
 	require.NoError(t, err)
 	assert.False(t, cfg.Extraction.IsEnabled())
+	assert.Nil(t, cfg.Extraction.Enabled, "deprecated Enabled must be cleared after env migration")
 	require.Len(t, cfg.Warnings, 1)
 	assert.Contains(t, cfg.Warnings[0], "MICASA_EXTRACTION_ENABLED")
 	assert.Contains(t, cfg.Warnings[0], "MICASA_EXTRACTION_ENABLE")