Problem

Issue A's investigation only audited LifecycleHost, GatewayHost, and ToolStreamHost — the three interfaces that surfaced as broken via gateway-disconnect symptoms. The RemoteClawApp class is also cast (via as unknown as Parameters<typeof X>[0]) to several other host interfaces:

• PollingHost (in ui/src/ui/app-polling.ts:6)
• ChatHost (in ui/src/ui/app-chat.ts:13)
• SettingsHost (in ui/src/ui/app-settings.ts:40)
• ScrollHost (in ui/src/ui/app-scroll.ts:4)
• CompactionHost (in ui/src/ui/app-tool-stream.ts:263 — extends ToolStreamHost)

Same risk class as Issue A: any required field on these interfaces that's missing on the production class will be undefined at runtime, with no type-error or test failure.

Audit method

For each host interface listed above:

1. Read the type definition; enumerate non-optional fields.
2. For each non-optional field, grep ui/src/ui/app.ts for an initializer ({field} = , @state() {field}, private {field}).
3. Report any field declared on the interface but missing on the class.

Reproducible script:

# Example for PollingHost
PHOST_FIELDS=$(awk '/^type PollingHost = \{/,/^\};/' ui/src/ui/app-polling.ts | grep -oE '^  [a-z][a-zA-Z]+:' | tr -d ':' | sed 's/^  //')
for field in $PHOST_FIELDS; do
  if ! grep -qE "(@state\(\)\s+|private\s+|public\s+|protected\s+)?${field}\s*[!?]?\s*[:=]" ui/src/ui/app.ts; then
    echo "MISSING (PollingHost): $field"
  fi
done

Repeat per interface; consolidate findings.

Acceptance criteria

• Audit complete for all 5 listed interfaces.
• Findings documented in PR description with field name, declaring interface, severity (fatal / latent crash / cosmetic — same taxonomy as Issue A).
• Missing fields with non-cosmetic severity are fixed in the same PR (3-line fixes per field, matching pattern of Issue A).
• Issue D's smoke test is extended to cover the additional host interfaces (cross-link).
• Cosmetic-severity gaps documented but optionally deferred (note in PR which were fixed vs deferred and why).
• pnpm tsgo, pnpm test, pnpm check all green.

Commit message

fix(ui): restore missing host-interface field initializers on RemoteClawApp — PollingHost/ChatHost/SettingsHost/ScrollHost/CompactionHost audit

Notes

Order of operation matters: this audit is more useful after Issue B (cast removal) lands, because at that point TypeScript will surface the missing fields as compile errors instead of requiring a manual audit. If Issue B is merged first, this issue may auto-close (the audit becomes "fix the new tsc errors"). Track both; close H if B's PR resolves all surfaced gaps.

References

• Related: Issue A (3 fields found in initial investigation)
• Related: Issue B (cast removal makes this audit unnecessary)
• Related: Issue D (extend smoke test to cover findings)