Bump MSRV to 1.92, add GCP deployment files (#40)

* Bump MSRV to 1.92 and add GCP deployment files

rig-core 0.30 uses let_chains (stabilized post-1.87), which breaks
builds on Rust 1.85. Bump rust-version in Cargo.toml and both
Dockerfiles to 1.92 (verified working).

Add cloud deployment scaffolding:
- Dockerfile: multi-stage build for the main agent container
- deploy/cloud-sql-proxy.service: systemd unit for Cloud SQL Auth Proxy
- deploy/ironclaw.service: systemd unit for the IronClaw container
- deploy/setup.sh: VM bootstrap script (Docker, proxy, services)
- deploy/env.example: reference environment configuration

Co-Authored-By: Claude Opus 4.6 <[email protected]>

* Address review feedback: harden deploy scaffolding

- Add comment explaining GATEWAY_HOST=0.0.0.0 and when to use 127.0.0.1
- Document /opt/ironclaw ownership model (root-owned, Docker reads as root)
- Switch cloud-sql-proxy service from User=root to DynamicUser=yes

Co-Authored-By: Claude Opus 4.6 <[email protected]>

* fix: Resolve clippy lints (Rust 1.93) and fix CI test workflow

- Fix 97 collapsible_if warnings using let-chains syntax (auto-fixed)
- Fix ptr_arg: change &PathBuf to &Path in pairing store functions
- Fix suspicious_open_options: add .truncate(false) to OpenOptions
- Fix too_many_arguments: add clippy allow on execute_status
- Fix unnecessary_unwrap: use if-let in repository.rs hybrid_search
- Gate unused EchoTool with #[cfg(test)]
- Add PairingStore argument to ChannelStoreData::new() test call sites
- Add skip guard for bundled channel test when WASM artifacts unavailable
- Split CI test workflow to exclude PostgreSQL-dependent integration tests

Co-Authored-By: Claude Opus 4.6 <[email protected]>

* fix: Address review feedback from ilblackdragon

- Add root check to setup.sh (exits with error if not root)
- Add warning comment to env.example about placeholder passwords
- Dockerfile.worker already uses rust:1.92 (no change needed)
- PR #41 overlap noted; will rebase after #41 merges

Co-Authored-By: Claude Opus 4.6 <[email protected]>

* fix: resolve 47 collapsible_if clippy warnings

Collapse nested if statements across the codebase to satisfy
clippy::collapsible_if on Rust 1.93.

Co-Authored-By: Claude Opus 4.6 <[email protected]>

---------

Co-authored-by: Claude Opus 4.6 <[email protected]>

deploy/env.example

@@ -0,0 +1,27 @@
+# WARNING: Replace all CHANGE_ME values before deploying.
+# Do not use placeholder passwords in production.
+DATABASE_URL=postgres://ironclaw:CHANGE_ME@localhost:5432/ironclaw
+
+# NEAR AI
+NEARAI_SESSION_TOKEN=CHANGE_ME
+NEARAI_MODEL=claude-3-5-sonnet-20241022
+NEARAI_BASE_URL=https://cloud-api.near.ai
+NEARAI_AUTH_URL=https://private.near.ai
+NEARAI_API_MODE=chat_completions
+
+# Agent
+AGENT_NAME=ironclaw
+CLI_ENABLED=false
+
+# Web Gateway
+GATEWAY_ENABLED=true
+# 0.0.0.0 binds to all interfaces (required for Docker --network=host).
+# Use 127.0.0.1 if running outside Docker or for local-only access.
+GATEWAY_HOST=0.0.0.0
+GATEWAY_PORT=3000
+GATEWAY_AUTH_TOKEN=CHANGE_ME
+
+# Disabled for initial deploy
+SANDBOX_ENABLED=false
+HEARTBEAT_ENABLED=false
+EMBEDDING_ENABLED=false