refactor: extract account manager cache entry wrapper

[ndycode]

Summary

• extract the account manager cache/reload entry wrappers out of index.ts
• keep the underlying cache state helper behavior unchanged while shrinking the runtime entrypoint
• add a focused test for the new runtime entry helper

Validation

• npm run typecheck
• npm run lint -- index.ts lib/runtime/account-manager-cache-entry.ts test/account-manager-cache-entry.test.ts
• npm run test -- test/account-manager-cache-entry.test.ts

note: greptile review for oc-chatgpt-multi-auth. cite files like lib/foo.ts:123. confirm regression tests + windows concurrency/token redaction coverage.

Greptile Summary

this pr extracts two inline closures from index.ts (invalidateAccountManagerCache and reloadAccountManagerFromDisk) into a dedicated lib/runtime/account-manager-cache-entry.ts module and adds a focused vitest suite. the refactoring is behaviorally identical to the original: setReloadInFlight is still called synchronously (no await precedes it inside the entry wrapper), so the concurrency-critical accountReloadInFlight assignment timing is unchanged.

• index.ts — delegates both cache operations to the new entry wrappers via setter callbacks; no logic change
• lib/runtime/account-manager-cache-entry.ts — new wrapper module; reloadAccountManagerFromDiskEntry is marked async despite having no await, which adds an unnecessary microtask wrap (P2)
• test/account-manager-cache-entry.test.ts — covers the happy path only; the in-flight dedup path, authFallback forwarding, and rejection propagation are not tested — worth adding to maintain the 80% threshold as the suite grows

Confidence Score: 4/5

• safe to merge — refactoring is behaviorally equivalent, no concurrency regression introduced
• the core logic is correct and synchronous assignment timing of accountReloadInFlight is preserved. only two non-blocking p2s remain: the unnecessary async keyword and missing vitest coverage for the dedup/error/authFallback paths.
• test/account-manager-cache-entry.test.ts — add dedup, authFallback, and rejection tests before the suite grows further

Important Files Changed

Filename	Overview
lib/runtime/account-manager-cache-entry.ts	new module; logic is correct and equivalent to what it replaced in index.ts — only nit is the unnecessary async on reloadAccountManagerFromDiskEntry (no await present)
test/account-manager-cache-entry.test.ts	happy-path only; missing dedup/in-flight, authFallback forwarding, and rejection-propagation tests — all three are straightforward to add and keep the 80% threshold healthy
index.ts	clean delegation to the new entry wrappers; synchronous assignment of accountReloadInFlight is preserved (setReloadInFlight runs before any await), so no timing or concurrency regression

Sequence Diagram

sequenceDiagram
    participant C as caller
    participant IDX as index.ts (reloadAccountManagerFromDisk)
    participant E as account-manager-cache-entry.ts (reloadAccountManagerFromDiskEntry)
    participant S as account-manager-cache.ts (reloadAccountManagerFromDiskState)
    participant D as AccountManager.loadFromDisk

    C->>IDX: reloadAccountManagerFromDisk(authFallback?)
    IDX->>E: reloadAccountManagerFromDiskEntry({currentReloadInFlight, ...})
    E->>S: reloadAccountManagerFromDiskState({currentReloadInFlight, loadFromDisk, authFallback, onLoaded, onSettled})
    alt currentReloadInFlight is non-null (dedup)
        S-->>E: existing Promise<TManager>
    else no in-flight reload
        S->>D: loadFromDisk(authFallback?)
        D-->>S: AccountManager
        S->>S: onLoaded(manager) → cachedAccountManager=manager
        S->>S: onSettled() → accountReloadInFlight=null
        S-->>E: new Promise<TManager>
    end
    E->>IDX: setReloadInFlight(inFlight) → accountReloadInFlight=inFlight
    E-->>IDX: Promise<TManager>
    IDX-->>C: Promise<AccountManager>

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Prompt To Fix All With AI

This is a comment left during a code review.
Path: lib/runtime/account-manager-cache-entry.ts
Line: 16

Comment:
**unnecessary `async` — no `await` inside**

`reloadAccountManagerFromDiskEntry` has no `await`, so the `async` keyword only adds an extra microtask wrap and an implicit outer promise shell. the function body already runs synchronously, so `setReloadInFlight` is called at the same tick either way — but it's cleaner to drop `async` and keep the return type explicit:

```suggestion
export function reloadAccountManagerFromDiskEntry<TManager>(params: {
```

drop `async` here and change the return type annotation accordingly. the callers in `index.ts` all `await` the result anyway, so nothing breaks.

How can I resolve this? If you propose a fix, please make it concise.

---

This is a comment left during a code review.
Path: test/account-manager-cache-entry.test.ts
Line: 25-41

Comment:
**missing vitest coverage — three untested paths**

the reload test only exercises the happy path with `currentReloadInFlight: null`. three cases are completely uncovered:

1. **dedup / in-flight reuse** — when `currentReloadInFlight` is a non-null promise, `setReloadInFlight` is still called (with the existing promise), and the entry returns without starting a new load. this is the concurrency-critical path, and it's unverified.

2. **`authFallback` forwarding** — no assertion that `reloadState` receives `authFallback` when provided. a typo or missing key in the spread would be invisible here.

3. **rejection propagation** — no test that a rejected `reloadAccountManagerFromDiskState` rejects the returned promise. given the 80 % coverage threshold in this repo, these gaps are worth closing before the suite grows further.

How can I resolve this? If you propose a fix, please make it concise.

_{Last reviewed commit: "refactor: extract ac..."}

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[ndycode]

Closing because this work is now included in main via #318 and #319.