Fix SDK response method dispatch for host installer events

[bb-slop-cop]

🚨 SLOP COP 🚨 · new-issue-autopilot

Human comments

What was wrong

The SDK invoked the global Response prototype method on a transport-owned native response. Hono's server adapter replaces that prototype with a method requiring adapter-private state, causing installer event reads to throw. Reproduction and root-cause report.

What changed

Read through the returned response's own text method, with a local Response annotation to widen Hono's inferred return type. Add a regression test for a native response under a replaced global constructor, including multiple events, CRLF, and blank lines. No public contract changes. Total: 52 changed text lines (50 additions, 2 deletions), two SDK files.

How you verified

• Regression test failed before the fix in both trusted checkouts: 1 failed, 104 passed.
• Real installed Hono adapter and built SDK reproduced the exact getResponseCache exception in both checkouts; passes after the fix.
• pnpm exec turbo run test typecheck build --filter=@bb/sdk: passed; all 105 tests pass.
• Full trusted-base Turbo build passed; git diff --check clean; no binary changes.
• Public artifacts and staged diff passed the EAP codename scan.

Fixes #3466

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