…scope (#449)

## Summary
🤖 Generated with [Nori](https://www.npmjs.com/package/nori-ai)

- Re-applies the Claude ACP adapter package rename from
`@zed-industries/claude-agent-acp` (frozen at 0.23.1) to
`@agentclientprotocol/claude-agent-acp` (active, latest 0.30.0)
- The original upgrade (PR #447) was reverted in PR #448 due to a
"Failed to create ACP session" error
- Root cause investigation showed the error was transient — the new
adapter v0.30.0 is fully protocol-compatible with our
`agent-client-protocol-schema v0.11.6`

## Investigation Details

The "Failed to create ACP session" error was traced through the full
error chain (`sacp_connection.rs:507` → `spawn_and_relay.rs:59-78` →
`agent.rs:273`). Manual protocol testing with v0.30.0 confirmed:
- `initialize` handshake succeeds (protocol version V1 negotiation)
- `session/new` request succeeds (schema fields `cwd` and `mcpServers`
are correct)
- `NewSessionResponse` deserializes correctly despite new fields
(`modes`, `configOptions`)

End-to-end TUI verification with `NORI_MANAGED_BY_NPM=1` (to force npx
and the real v0.30.0 adapter) confirmed full round-trip: spawn →
handshake → session → prompt → response.

## Test Plan
- [x] `test_get_claude_code_config` verifies the built-in Claude config
uses the new package name
- [x] All 443 passing ACP crate tests still pass (14 pre-existing
failures in `backend::tests::part3` are unrelated — they require a mock
ACP binary)
- [x] End-to-end TUI verification: built nori binary, launched via tmux
with real Claude adapter v0.30.0, sent a message and received a response
- [x] Clippy clean

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Co-authored-by: Nori <contact@tilework.tech>