chore: consolidate auth and session operation analytics

[Leeeon233]

Related issue

Problem / pressure

The authenticated route emitted app/active and app/auth_ready consecutively with identical properties. Session controls also emitted request events before an existing result/open event. This is source-level redundancy; aggregate observations do not establish production duplication rates or prove failure is impossible.

Summary

Remove app/auth_ready, session/stop_requested, session/queue_item_reorder_requested, and session/search_open_requested. Preserve renderer/CLI app/active, auth timing/OS properties, stop blocking/failures, reorder failures, and search outcomes. Add helper duration_ms to stop/reorder success and failure. Local OSS telemetry remains hard-disabled.

The draft bilingual Spec and Note document migration and semantics: cancel helper resolution is not turn-stop acknowledgment, and reorder resolution can include no-ops. Retired request events no longer provide a denominator for requests that never settle. Existing dashboards need event-name migration when their host adopts this change.

Visual explanation

Simple change: capture-call removal and result timing do not change control flow. The mapping below shows the entire event reduction.

Before / after

Before	After
Auth readiness: active + auth_ready	active, with the same readiness properties
Stop: request + helper result	helper result + duration; blocked/failure retained
Reorder: request + helper result	helper result + duration; failure retained
Search menu: request + conversation opened	conversation opened

Test plan

• Passed: 5 focused component suites, 80 tests (session-chat-search, workspace-machine-rpc-facade, posthog-analytics, posthog-provider, deferred-posthog).
• Passed: pnpm format, component route generation (no generated diff), pnpm run docs check (existing warnings only), git diff --check, i18n, Code Collab import, platform-boundary and public-boundary checks.
• pnpm check: typecheck and lint passed; stopped at the unchanged CLI github-git-transport.test.ts recursive SSH submodule test with context_unreadable. CLI totals: 3645 passed, 1 failed, 4 skipped. The same failure reproduces when running that file alone (5 passed, 1 failed). The remaining full test pipeline is not claimed green.
• No production ingestion, dashboard configuration, or hosted rollout was tested.

Context handoff

Same-repository maintainer change. Public implementation evidence and limits are recorded in specs/auth-session-analytics.md and .agents/notes/implemented/simplification/2026-10-09-auth-session-analytics.md. No production raw events, private source, or transcripts are included. Hosted rollout and dashboard migration are outside this PR.

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