feat(segments): activation gates to skip provably-inactive segments

.agents/skills/segment-docs/SKILL.md

@@ -33,7 +33,7 @@ Options are declared as `options.Option` string constants in the segment's `cons
 ```go
 const (
     BranchIcon    options.Option = "branch_icon"    // option name used in config
-    FetchStatus   options.Option = "fetch_status"
+    NativeStatus  options.Option = "native_status"
 )
 ```
 
@@ -53,7 +53,6 @@ segments without appearing in a segment-specific `const` block:
 
 | Option name | Type | Default |
 | ----------- | ---- | ------- |
-| `fetch_version` | `boolean` | varies |
 | `always_enabled` | `boolean` | `false` |
 | `display_default` | `boolean` | `true` |
 | `display_error` | `boolean` | `true` |

src/config/config.go

@@ -96,6 +96,13 @@ type Config struct {
 	AutoUpgrade             bool `json:"-" toml:"-" yaml:"-"`
 	EnableCursorPositioning bool `json:"enable_cursor_positioning,omitempty" toml:"enable_cursor_positioning,omitempty" yaml:"enable_cursor_positioning,omitempty"`
 	MigrateGlyphs           bool `json:"-" toml:"-" yaml:"-"`
+	// FieldSetsVersion records which analyzer generation stamped this
+	// config's segments with their template field sets (see
+	// fieldSetAnalysisVersion); zero means unstamped. Exported, and kept out
+	// of every config format, so the session cache's gob round trip carries
+	// the marker and restored configs skip re-analysis exactly when their
+	// stamps are current.
+	FieldSetsVersion int `json:"-" toml:"-" yaml:"-"`
 }
 
 func (cfg *Config) MakeColors(env runtime.Environment) color.String {

src/config/default.go

@@ -19,8 +19,6 @@ const (
 	// Mirror segment option keys locally rather than importing segments,
 	// which drags its full transitive dep tree into the wasm build.
 	branchTemplate      options.Option = "branch_template"
-	fetchStatus         options.Option = "fetch_status"
-	fetchUpstreamIcon   options.Option = "fetch_upstream_icon"
 	homeEnabled         options.Option = "home_enabled"
 	fetchPackageManager options.Option = "fetch_package_manager"
 	displayMode         options.Option = "display_mode"
@@ -85,9 +83,7 @@ func Default(configError error) *Config {
 							"{{ if gt .Ahead 0 }}p:white{{ end }}",
 						},
 						Options: options.Map{
-							branchTemplate:    "{{ trunc 25 .Branch }}",
-							fetchStatus:       true,
-							fetchUpstreamIcon: true,
+							branchTemplate: "{{ trunc 25 .Branch }}",
 						},
 						Template: " {{ if .UpstreamURL }}{{ url .UpstreamIcon .UpstreamURL }} {{ end }}{{ .HEAD }}{{if .BranchStatus }} {{ .BranchStatus }}{{ end }}{{ if .Working.Changed }} \uf044 {{ .Working.String }}{{ end }}{{ if .Staging.Changed }} \uf046 {{ .Staging.String }}{{ end }} ", //nolint:lll
 					},
@@ -137,9 +133,6 @@ func Default(configError error) *Config {
 						Foreground: paletteBlue,
 						Background: backgroundTransparent,
 						Template:   "\ue626 ",
-						Options: options.Map{
-							options.FetchVersion: false,
-						},
 					},
 					{
 						Type:       PYTHON,
@@ -148,9 +141,8 @@ func Default(configError error) *Config {
 						Background: backgroundTransparent,
 						Template:   "\ue235 ",
 						Options: options.Map{
-							options.FetchVersion: false,
-							displayMode:          "files",
-							fetchVirtualEnv:      false,
+							displayMode:     "files",
+							fetchVirtualEnv: false,
 						},
 					},
 					{
@@ -278,10 +270,6 @@ func statuslineCLIConfig(hash uint64, segmentType SegmentType, template string)
 							"{{ if or (.Working.Changed) (.Staging.Changed) }}p:black{{ end }}",
 							"{{ if or (gt .Ahead 0) (gt .Behind 0) }}p:white{{ end }}",
 						},
-						Options: options.Map{
-							fetchStatus:       true,
-							fetchUpstreamIcon: false,
-						},
 						Template: " {{ if .UpstreamURL }}{{ url .UpstreamIcon .UpstreamURL }} {{ end }}{{ .HEAD }}{{if .BranchStatus }} {{ .BranchStatus }}{{ end }}{{ if .Working.Changed }} \uf044 {{ nospace .Working.String }}{{ end }}{{ if .Staging.Changed }} \uf046 {{ .Staging.String }}{{ end }} ", //nolint:lll
 					},
 					{