docs(buglog): log follow-ups of the P0 fixes (bug-1958..bug-1966)

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

.wolf/bugs/bug-1961.md

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+---
+id: "bug-1961"
+status: "open"
+status_updated: "2026-10-10"
+status_note: "newly logged"
+component: "apiserver"
+severity: "wrong-result"
+timestamp: "2026-10-10T10:16:04Z"
+last_seen: "2026-10-10T10:16:04Z"
+occurrences: 1
+files: ["src/frontend/apiserver/controllers/hosts.go"]
+tags: ["apiserver", "hosts"]
+related: []
+---
+
+# bug-1961: apiserver ControlHost writes a second response after validateHost rejected the request
+
+## Description
+**Observed:** (source reading; follow-up of the 2026-10-10 P0 fixes (bug-1936..1957))
+Reported by the bug-1949 fix: `validateHost` (`controllers/hosts.go`) writes a 403 via `ReturnError` without aborting and `ControlHost` continues and writes another response (today masked by the route's RequirePermission).
+
+**Expected:** A rejected host control stops after the first error response.
+**Impact:** Wrong result / noise: double responses, possible action after a rejection if the route guard changes.
+**Found by:** follow-up of the 2026-10-10 P0 fixes (bug-1936..1957)
+## Environment
+- OS: no /etc/os-release; Docker container; NixOS kernel; kernel Linux 6.18.33 x86_64
+- libc: glibc 2.42-47 (interpreter /nix/store/wb6rhpznjfczwlwx23zmdrrw74bayxw4-glibc-2.42-47/lib/ld-linux-x86-64.so.2)
+- Toolchain: gcc (GCC) 15.2.0, meson 1.9.1
+- Build: asan (xce.build)
+- Code: scheduler-framework @ 19be145d-dirty
+- Deployment: any (found by source reading; confirmed by the RED test of the fix)
+
+## Reproduction
+1. Call ControlHost so that validateHost rejects (see the handler) with the route guard removed in a unit test; two writes occur.
+- Frequency: deterministic (by code reading; confirmed by the RED test of the fix)
+- Evidence: the code sites quoted in Description; no logs kept.
+## Root cause
+TODO: required for fixed/partial
+
+## Fix
+TODO: required for fixed/partial
+
+## Verification
+- Test: TODO: name + file; RED before the fix, GREEN after
+- Suites: TODO: suite results and build profile
+- Live: TODO: soak/deploy run, or n/a and why
+
+## References
+- Related: none