fix(friends): OperationCanceledException-safe friends prewarm on reconnect

[eordano]

Production evidence (decentraland Sentry, archive snapshot 2026-07-17):

• UNITY-EXPLORER-PFR: 1 events / 1 users, last seen 2026-07-10
• UNITY-EXPLORER-PF9: 1 events / 1 users, last seen 2026-07-06
• UNITY-EXPLORER-PE6: 1 events / 1 users, last seen 2026-07-01
• UNITY-TEST-ENVIRONMENT-1CK: 1 events / 1 users, last seen 2026-07-08
• UNITY-TEST-ENVIRONMENT-1F2: 1 events / 1 users, last seen 2026-06-30
• UNITY-TEST-ENVIRONMENT-1EE: 1 events / 1 users, last seen 2026-06-19

---

Supersedes #9408: moved from the fork into the org repo so CI workflows receive repository secrets (fork PRs do not).

[github-actions]

New build in progress, come back later!

[github-actions]

Slack notification sent to #explorer-ext-contributions for external review.
To re-send, delete this comment and re-add the ext-contribution label.

[decentraland-bot]

PR Review — fix(friends): OperationCanceledException-safe friends prewarm on reconnect

STEP 2 — Root-cause check: PASS ✅

The PR fixes unhandled OperationCanceledException in a detached UniTaskVoid flow (PrewarmAsync). The token (prewarmFriendsCancellationToken) is SafeRestart()ed on reconnect, which cancels any in-flight prewarm. Without the try-catch, the cancellation exception propagates unhandled from the fire-and-forget call, causing the Sentry crashes listed in the PR description. This is the correct fix — the root cause is the missing exception handling in a detached async flow, not a symptom workaround.

STEP 3 — Design & integration: PASS ✅

No new long-lived units introduced. The change adds a try-catch inside an existing local function (PrewarmAsync). No lifecycle duplication, no per-frame reconciliation, no persistent state outside ECS. The cancellation-on-reconnect flow is correct: SafeRestart() cancels any prior prewarm, the catch swallows the expected OperationCanceledException, and the Unsubscribe is correctly skipped on cancellation (so the next loading-complete event re-triggers the prewarm).

Teardown trace: The prewarmFriendsCancellationToken CTS is SafeCancelAndDispose()d in Dispose() (line ~156) — no leak.

STEP 4 — Member audit: N/A

No public properties or accessors added or changed.

STEP 5 — Line-level findings

#	Severity	File	Line	Issue
1	P2	FriendsContainer.cs	249	Missing general exception catch per CLAUDE.md §9

See inline comment with suggestion below.

Security review

No security issues found.

CI status

• semantic / title-matches-convention — ❌ failing
• Build (windows64), Build (macos) — ⏳ pending
• Test (editmode), Test (playmode), Lint — ⏳ pending
• QA and DEV Approvals — ❌ waiting on approvals

STEP 6–9 — Verdict

REVIEW_RESULT: PASS ✅
COMPLEXITY: SIMPLE
COMPLEXITY_REASON: Single-file try-catch addition in an existing async local function; no ECS, system, or architectural changes.
QA_REQUIRED: YES

---

Reviewed by Jarvis 🤖 · Requested by unknown via Slack

[decentraland-bot]

[P2] Missing general exception handler (CLAUDE.md §9).

The convention for detached UniTaskVoid flows requires: "Always catch exceptions: Ignore OperationCanceledException, Log/report all others via ReportHub.LogException."

The current catch handles cancellation correctly, but friendsPanelController.InitAsync(ct) could throw non-cancellation exceptions (network errors, deserialization failures, null references) that would still propagate unhandled — the same class of unhandled crash this PR aims to prevent.

Compare with the neighboring SyncBlockingStatusAsync which uses .SuppressToResultAsync(ReportCategory.FRIENDS) to handle both cases.

Suggested change

	catch (OperationCanceledException) { }
	catch (OperationCanceledException) { }
	catch (Exception e) { ReportHub.LogException(e, ReportCategory.FRIENDS); }

[eordano]

Closed in favor of the compound PR #9430 (team decision — all fixes in this set land and iterate there; each fix remains individually reviewable as its own merge commit in #9430).