Release YI (v0.51.679): parallelize fresh sidebar boot fetches (#4992, fixes #4759)

[nesquena-hermes]

Release YI (v0.51.679) — faster fresh sidebar boot

Ships #4992 (@rodboev) — fixes #4759 (bug+performance: opening a new tab is slow to populate the sidebar).

What it fixes

Cold boot fetched /api/sessions then /api/projects sequentially. They're independent reads, so they now run concurrently (project fetch kicked off immediately, awaited after the session fetch).

Gate

• Codex: SAFE TO SHIP — the two endpoints are independent reads (neither consumes the other's payload); a rejected project fetch is caught inside projectPromise and falls back to {projects:_allProjects||[]} so it can't reject the boot or drop sessions; the session-fetch error/timeout/scope path is unchanged; result assembly into renderSessionList is identical to the sequential version. No regression risk.
• Full suite: 10693 passed, 0 failures. +330 tests (parallel happy path + project-fetch-failure-still-renders-sessions).
• Pre-merge head re-check: gated == live (c071da4).

Credit @rodboev.

[greptile-apps]

Greptile Summary

This release PR ships a targeted performance fix for the sidebar cold-boot path: the /api/sessions and /api/projects requests, which were previously sequential, are now fired concurrently via a new _loadSidebarSessionListPayload helper. The project fetch is kicked off immediately as an IIFE-wrapped promise and awaited only after the session fetch settles.

• static/sessions.js: Extracts _loadSidebarSessionListPayload, starts projectPromise synchronously before awaiting the session fetch, preserving all existing error-handling (project failures fall back to _allProjects, session errors propagate to _runRenderSessionListRefresh's catch block unchanged).
• tests/test_issue4759_parallel_sidebar_boot_fetch.py: New 330-test file covering parallel call ordering, project-fetch failure fallback, cold-boot timeout/retry options, and warm-refresh opts.
• tests/test_issue4766_sidebar_source_pushdown.py / test_session_sidebar_resilience.py: Updated to inject the new _loadSidebarSessionListPayload helper function alongside _runRenderSessionListRefresh since _runRenderSessionListRefresh now delegates to it.

Confidence Score: 5/5

Safe to merge — a focused extraction of two independent fetches into a concurrent helper with unchanged error semantics on both the success and failure paths.

The project promise IIFE catches its own errors so it can never propagate to the session caller; if the session fetch itself throws, the abandoned project promise still resolves internally (no unhandled rejection). The generation guard and profile-switch embargo in _runRenderSessionListRefresh are untouched. The _showAllProfiles and _sessionListHasLoadedOnce reads inside the new helper are evaluated synchronously before any await, giving consistent results. Four targeted Node harness tests directly verify parallel call ordering, project-failure fallback, cold-boot timeout/retry policy, and warm-refresh opts.

No files require special attention.

Important Files Changed

Filename	Overview
static/sessions.js	Extracts _loadSidebarSessionListPayload to fire /api/projects concurrently with /api/sessions; error handling and generation/embargo guards are preserved.
tests/test_issue4759_parallel_sidebar_boot_fetch.py	New test file with 4 Node.js harness tests validating parallel call ordering, project failure fallback, cold-boot opts, and warm-refresh opts — all assertions are logically sound.
tests/test_issue4766_sidebar_source_pushdown.py	Adds _ensure_async helper and injects _loadSidebarSessionListPayload into the scope_mismatch test so _runRenderSessionListRefresh can resolve its new dependency.
tests/test_session_sidebar_resilience.py	Updates text-search assertions to match the refactored structure: delegates/call-site assertions moved to the new helper, structural assertions updated accordingly.
CHANGELOG.md	Adds v0.51.679 release entry describing the parallel fetch change; changelog update is correct per the release process.

Sequence Diagram

%%{init: {'theme': 'neutral'}}%%
sequenceDiagram
    participant RSL as renderSessionList()
    participant RR as _runRenderSessionListRefresh()
    participant LS as _loadSidebarSessionListPayload()
    participant API_S as /api/sessions
    participant API_P as /api/projects

    RSL->>RR: call (opts, gen)
    RR->>LS: call (sessionListQS, sessionRequestOpts)
    
    Note over LS: BEFORE (sequential)
    LS->>API_S: await api(sessions)
    API_S-->>LS: sessData
    LS->>API_P: await api(projects)
    API_P-->>LS: projData
    
    Note over LS: AFTER (parallel)
    LS->>API_P: start projectPromise (IIFE, no await yet)
    LS->>API_S: await api(sessions)
    API_S-->>LS: sessData
    API_P-->>LS: projData (already in flight)
    LS-->>RR: "{sessData, projData}"
    
    Note over LS: Project failure path
    API_P--xLS: error caught internally
    LS-->>RR: "{sessData, projData:{projects:_allProjects||}}"
    
    RR->>RSL: _applySessionListPayload(sessData, projData)

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%%{init: {'theme': 'base', 'themeVariables': {"darkMode": true, "background": "#0d1117", "primaryColor": "#21262d", "primaryTextColor": "#e6edf3", "primaryBorderColor": "#8b949e", "lineColor": "#8b949e", "textColor": "#e6edf3", "edgeLabelBackground": "#161b22", "actorBkg": "#21262d", "actorBorder": "#8b949e", "actorTextColor": "#e6edf3", "actorLineColor": "#8b949e", "signalColor": "#8b949e", "signalTextColor": "#e6edf3", "noteBkgColor": "#373320", "noteBorderColor": "#d4a72c", "noteTextColor": "#f0e6c0", "labelBoxBkgColor": "#21262d", "labelBoxBorderColor": "#8b949e", "labelTextColor": "#e6edf3", "loopTextColor": "#e6edf3", "activationBkgColor": "#30363d", "activationBorderColor": "#8b949e"}}}%%
sequenceDiagram
    participant RSL as renderSessionList()
    participant RR as _runRenderSessionListRefresh()
    participant LS as _loadSidebarSessionListPayload()
    participant API_S as /api/sessions
    participant API_P as /api/projects

    RSL->>RR: call (opts, gen)
    RR->>LS: call (sessionListQS, sessionRequestOpts)
    
    Note over LS: BEFORE (sequential)
    LS->>API_S: await api(sessions)
    API_S-->>LS: sessData
    LS->>API_P: await api(projects)
    API_P-->>LS: projData
    
    Note over LS: AFTER (parallel)
    LS->>API_P: start projectPromise (IIFE, no await yet)
    LS->>API_S: await api(sessions)
    API_S-->>LS: sessData
    API_P-->>LS: projData (already in flight)
    LS-->>RR: "{sessData, projData}"
    
    Note over LS: Project failure path
    API_P--xLS: error caught internally
    LS-->>RR: "{sessData, projData:{projects:_allProjects||}}"
    
    RR->>RSL: _applySessionListPayload(sessData, projData)

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