[codex-analytics] emit goal lifecycle analytics (#27078)

## Why
- Currently, there is no analytics event for `/goal` behavior
- Existing events cannot identify goal execution or its resulting
outcome
- The original update in
[#26182](https://github.com/openai/codex/pull/26182) was implemented
before `/goal` moved into `codex-goal-extension`.

## What Changed
- Adds `codex_goal_event` serialization and enrichment to
`codex-analytics`
- Emits goal events from the canonical `codex-goal-extension` mutation
and accounting paths:
  - `created` when a new logical goal is persisted
  - `usage_accounted` when cumulative goal usage is persisted
  - `status_changed` when the stored goal status changes
  - `cleared` when the goal is deleted
- Preserves causal `turn_id` for turn driven events and uses null
attribution for external or idle lifecycle events
- Changes goal deletion to return the deleted row so `cleared` retains
the stable goal ID

## Event Details

Includes standard analytics metadata along with goal specific fields:
- `goal_id`: Stable ID stored in the local SQLite goal row and shared
across the goal's events
- `event_kind`: Observed operation (see the 4 lifecycle events cited in
the above bullet)
- `goal_status`: Resulting or last stored status: `active`, `paused`,
`blocked`, `usage_limited`, etc.
  - `has_token_budget`: Indicates whether a token budget is configured
  - `turn_id`: Causal turn ID, or null when no causal turn exists
- `cumulative_tokens_accounted`: Cumulative tokens on `usage_accounted`
events; null otherwise
- `cumulative_time_accounted_seconds`: Cumulative active time on
`usage_accounted` events; null otherwise

## Validation
- `just test -p codex-analytics -p codex-state -p codex-goal-extension`
- `just test -p codex-core -E 'test(/goal/)'`
- `just test -p codex-app-server`
- `cargo build -p codex-analytics -p codex-core -p codex-state -p
codex-app-server`

codex-rs/analytics/src/events.rs

@@ -4,12 +4,14 @@ use crate::facts::AcceptedLineFingerprint;
 use crate::facts::AppInvocation;
 use crate::facts::CodexCompactionEvent;
 use crate::facts::CodexErrKind;
+use crate::facts::CodexGoalEvent;
 use crate::facts::CompactionImplementation;
 use crate::facts::CompactionPhase;
 use crate::facts::CompactionReason;
 use crate::facts::CompactionStatus;
 use crate::facts::CompactionStrategy;
 use crate::facts::CompactionTrigger;
+use crate::facts::GoalEventKind;
 use crate::facts::HookRunFact;
 use crate::facts::InvocationType;
 use crate::facts::PluginState;
@@ -63,6 +65,7 @@ pub(crate) enum TrackEventRequest {
     AppUsed(CodexAppUsedEventRequest),
     HookRun(CodexHookRunEventRequest),
     Compaction(Box<CodexCompactionEventRequest>),
+    Goal(Box<CodexGoalEventRequest>),
     TurnEvent(Box<CodexTurnEventRequest>),
     TurnSteer(CodexTurnSteerEventRequest),
     CommandExecution(CodexCommandExecutionEventRequest),
@@ -771,6 +774,30 @@ pub(crate) struct CodexCompactionEventRequest {
     pub(crate) event_params: CodexCompactionEventParams,
 }
 
+#[derive(Serialize)]
+pub(crate) struct CodexGoalEventParams {
+    pub(crate) thread_id: String,
+    pub(crate) session_id: String,
+    pub(crate) turn_id: Option<String>,
+    pub(crate) app_server_client: CodexAppServerClientMetadata,
+    pub(crate) runtime: CodexRuntimeMetadata,
+    pub(crate) thread_source: Option<ThreadSource>,
+    pub(crate) subagent_source: Option<String>,
+    pub(crate) parent_thread_id: Option<String>,
+    pub(crate) goal_id: String,
+    pub(crate) event_kind: GoalEventKind,
+    pub(crate) goal_status: codex_state::ThreadGoalStatus,
+    pub(crate) has_token_budget: bool,
+    pub(crate) cumulative_tokens_accounted: Option<i64>,
+    pub(crate) cumulative_time_accounted_seconds: Option<i64>,
+}
+
+#[derive(Serialize)]
+pub(crate) struct CodexGoalEventRequest {
+    pub(crate) event_type: &'static str,
+    pub(crate) event_params: CodexGoalEventParams,
+}
+
 #[derive(Serialize)]
 pub(crate) struct CodexTurnEventParams {
     pub(crate) thread_id: String,
@@ -979,6 +1006,33 @@ pub(crate) fn codex_compaction_event_params(
     }
 }
 
+pub(crate) fn codex_goal_event_params(
+    input: CodexGoalEvent,
+    session_id: String,
+    app_server_client: CodexAppServerClientMetadata,
+    runtime: CodexRuntimeMetadata,
+    thread_source: Option<ThreadSource>,
+    subagent_source: Option<String>,
+    parent_thread_id: Option<String>,
+) -> CodexGoalEventParams {
+    CodexGoalEventParams {
+        thread_id: input.thread_id,
+        session_id,
+        turn_id: input.turn_id,
+        app_server_client,
+        runtime,
+        thread_source,
+        subagent_source,
+        parent_thread_id,
+        goal_id: input.goal_id,
+        event_kind: input.event_kind,
+        goal_status: input.goal_status,
+        has_token_budget: input.has_token_budget,
+        cumulative_tokens_accounted: input.cumulative_tokens_accounted,
+        cumulative_time_accounted_seconds: input.cumulative_time_accounted_seconds,
+    }
+}
+
 pub(crate) fn codex_plugin_used_metadata(
     tracking: &TrackEventsContext,
     plugin: PluginTelemetryMetadata,