update ci rust version

.gitlab-ci.yml

@@ -17,7 +17,7 @@ variables:
 # Test stage - compile and check code
 test:
   stage: test
-  image: rust:1.75-alpine
+  image: rust:1.82-alpine
   before_script:
     - apk add --no-cache musl-dev
   script:

DEPLOYMENT.md

@@ -193,7 +193,12 @@ docker run --rm \
 
 ### Test Before Pushing
 
+**Prerequisites**: Rust 1.82+ (required for Cargo.lock v4)
+
 ```bash
+# Check Rust version
+rustc --version  # Should be 1.82.0 or later
+
 # Check compilation
 cargo check --release
 
@@ -286,6 +291,22 @@ Recommended settings:
 
 ## Troubleshooting
 
+### Pipeline Fails with "lock file version not understood"
+
+**Symptom**:
+```
+error: failed to parse lock file at: /builds/graham/towerops-agent/Cargo.lock
+Caused by:
+  lock file version `4` was found, but this version of Cargo does not understand this lock file
+```
+
+**Cause**: Cargo.lock version 4 requires Rust 1.77+
+
+**Fix**: The CI configuration uses Rust 1.82. If you see this error:
+1. Update `.gitlab-ci.yml` to use `rust:1.82-alpine` or later
+2. Update `Dockerfile` to use `rust:1.82-alpine` or later
+3. Regenerate Cargo.lock: `cargo update` (if needed)
+
 ### Pipeline Fails at Test Stage
 
 **Symptom**: `cargo check` or `cargo clippy` fails

Dockerfile

@@ -1,5 +1,5 @@
 # Build stage
-FROM rust:1.75-alpine AS builder
+FROM rust:1.82-alpine AS builder
 
 WORKDIR /app
 

README.md

@@ -91,7 +91,7 @@ If the API is unreachable, metrics are stored locally for up to 24 hours. When c
 
 ### Prerequisites
 
-- Rust 1.75 or later
+- Rust 1.82 or later (required for Cargo.lock v4)
 - SQLite development libraries
 
 ### Build