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]>

src/workspace/mod.rs

@@ -333,10 +333,10 @@ impl Workspace {
         ];
 
         for (path, header) in identity_files {
-            if let Ok(doc) = self.read(path).await {
-                if !doc.content.is_empty() {
-                    parts.push(format!("{}\n\n{}", header, doc.content));
-                }
+            if let Ok(doc) = self.read(path).await
+                && !doc.content.is_empty()
+            {
+                parts.push(format!("{}\n\n{}", header, doc.content));
             }
         }
 
@@ -345,15 +345,15 @@ impl Workspace {
         let yesterday = today.pred_opt().unwrap_or(today);
 
         for date in [today, yesterday] {
-            if let Ok(doc) = self.daily_log(date).await {
-                if !doc.content.is_empty() {
-                    let header = if date == today {
-                        "## Today's Notes"
-                    } else {
-                        "## Yesterday's Notes"
-                    };
-                    parts.push(format!("{}\n\n{}", header, doc.content));
-                }
+            if let Ok(doc) = self.daily_log(date).await
+                && !doc.content.is_empty()
+            {
+                let header = if date == today {
+                    "## Today's Notes"
+                } else {
+                    "## Yesterday's Notes"
+                };
+                parts.push(format!("{}\n\n{}", header, doc.content));
             }
         }
 

src/workspace/search.rs

@@ -201,11 +201,11 @@ pub fn reciprocal_rank_fusion(
         .collect();
 
     // Normalize scores to 0-1 range
-    if let Some(max_score) = results.iter().map(|r| r.score).reduce(f32::max) {
-        if max_score > 0.0 {
-            for result in &mut results {
-                result.score /= max_score;
-            }
+    if let Some(max_score) = results.iter().map(|r| r.score).reduce(f32::max)
+        && max_score > 0.0
+    {
+        for result in &mut results {
+            result.score /= max_score;
         }
     }