diff --git a/.copier-answers.yml b/.copier-answers.yml
new file mode 100644
index 0000000..bcbd320
--- /dev/null
+++ b/.copier-answers.yml
@@ -0,0 +1,6 @@
+# Changes here will be overwritten by Copier
+_commit: v1.7.2
+_src_path: https://github.com/DeveloperC286/template
+project_name: monkey_interpreter
+project_type: rust
+uses_git: false
diff --git a/.github/renovate.json5 b/.github/renovate.json5
index d79fc9d..945c8ab 100644
--- a/.github/renovate.json5
+++ b/.github/renovate.json5
@@ -4,6 +4,9 @@
     "config:best-practices"
   ],
   "automerge": true,
+  "github-actions": {
+    "enabled": false
+  },
   "nix": {
     "enabled": true,
     "lockFileMaintenance": {
diff --git a/.github/workflows/continuous-integration.yml b/.github/workflows/continuous-integration.yml
index 560b6d0..ec3687c 100644
--- a/.github/workflows/continuous-integration.yml
+++ b/.github/workflows/continuous-integration.yml
@@ -6,6 +6,19 @@ permissions:
   contents: read
 
 jobs:
+  permissions:
+    name: Permissions
+    runs-on: ${{ matrix.architecture }}
+    strategy:
+      matrix:
+        architecture: [ubuntu-24.04, ubuntu-24.04-arm]
+        language: [shell]
+    steps:
+      - name: Checkout code.
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+      - name: Check permissions.
+        run: make check-${{ matrix.language }}-permissions
+
   formatting:
     name: Formatting
     runs-on: ${{ matrix.architecture }}
@@ -36,17 +49,20 @@ jobs:
       - name: Check linting.
         run: nix develop -c make check-${{ matrix.language }}-linting
 
-  scripts-permissions:
-    name: Scripts Permissions
+  dependencies:
+    name: Dependencies
     runs-on: ${{ matrix.architecture }}
     strategy:
       matrix:
         architecture: [ubuntu-24.04, ubuntu-24.04-arm]
+        language: [rust]
     steps:
       - name: Checkout code.
         uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
-      - name: Check scripts permissions.
-        run: make check-scripts-permissions
+      - name: Setup Nix.
+        uses: cachix/install-nix-action@4e002c8ec80594ecd40e759629461e26c8abed15 # v31.9.0
+      - name: Check dependencies.
+        run: nix develop -c make check-${{ matrix.language }}-dependencies
 
   compile:
     name: Compile
diff --git a/.github/workflows/conventional-commits.yml b/.github/workflows/conventional-commits.yml
index 56eb9a6..358f390 100644
--- a/.github/workflows/conventional-commits.yml
+++ b/.github/workflows/conventional-commits.yml
@@ -1,6 +1,8 @@
 name: Conventional Commits
 
-on: pull_request
+on:
+  pull_request:
+    types: [opened, edited, synchronize, reopened]
 
 permissions:
   contents: read
@@ -10,7 +12,7 @@ jobs:
     name: Linting
     runs-on: ubuntu-24.04
     container:
-      image: ghcr.io/developerc286/conventional_commits_linter:0.17.0@sha256:d6fb0dfd79c2e06897692bc3f0dc62bcb7ce90a92030c81a3137935516d525d7
+      image: ghcr.io/developerc286/conventional_commits_linter:0.17.1@sha256:f1b947937ee884ba7f886d04939cd4858f9aeafb50dcf94925a516c50e43021b
     steps:
       - name: Checkout code.
         uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
@@ -18,4 +20,7 @@ jobs:
           ref: ${{ github.event.pull_request.head.sha }}
           fetch-depth: 0
       - name: Check Conventional Commits linting.
-        run: conventional_commits_linter --type angular "origin/${{ github.base_ref }}"
+        env:
+          PR_TITLE: ${{ github.event.pull_request.title }}
+          PR_BODY: ${{ github.event.pull_request.body }}
+        run: printf '%s\n\n%s' "$PR_TITLE" "$PR_BODY" | conventional_commits_linter -
diff --git a/.github/workflows/git-history.yml b/.github/workflows/git-history.yml
index 476fc11..1b18abe 100644
--- a/.github/workflows/git-history.yml
+++ b/.github/workflows/git-history.yml
@@ -10,7 +10,7 @@ jobs:
     name: Clean
     runs-on: ubuntu-24.04
     container:
-      image: ghcr.io/developerc286/clean_git_history:1.1.5@sha256:b1374591d48393f6b5fcc888f6bc7da05f7d218961f7850112130b1cad78186a
+      image: ghcr.io/developerc286/clean_git_history:1.1.6@sha256:93fd9c692f6e629956921b8d068ccad33760882b6e0c6d4d32cd963380aec25f
     steps:
       - name: Checkout code.
         uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
diff --git a/.gitignore b/.gitignore
index 97a06e3..2b4217c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,16 +1,13 @@
 # Rust .gitignore
 # Generated by Cargo
-debug/
-target/
+debug
+target
 
 # Generated by rustfmt
 **/*.rs.bk
 
 # Generated by proptest
-proptest-regressions/
-
-# Generated by IntelliJ IDEA
-.idea/
+proptest-regressions
 
 # Generated by direnv & Nix.
-.direnv/
+.direnv
diff --git a/Makefile b/Makefile
index 25691b9..4b28345 100644
--- a/Makefile
+++ b/Makefile
@@ -1,8 +1,10 @@
 # Auto-detect musl target for static binaries (Linux only)
+# Only set MUSL_TARGET on supported architectures; targets that need it will check
 MUSL_TARGET := $(shell uname -m | sed 's/^x86_64$$/x86_64-unknown-linux-musl/;s/^aarch64$$/aarch64-unknown-linux-musl/')
-ifeq ($(filter %unknown-linux-musl,$(MUSL_TARGET)),)
-    $(error Unsupported architecture: $(shell uname -m). Static musl builds only supported on Linux x86_64 and aarch64)
-endif
+
+define check-musl-target
+$(if $(filter %unknown-linux-musl,$(MUSL_TARGET)),,$(error Unsupported architecture: $(shell uname -m). Static musl builds only supported on Linux x86_64 and aarch64))
+endef
 
 # Use --locked in CI to ensure reproducible builds
 CARGO_LOCKED := $(if $(CI),--locked,)
@@ -10,26 +12,30 @@ CARGO_LOCKED := $(if $(CI),--locked,)
 .PHONY: default
 default: compile
 
+.PHONY: check-shell-permissions
+check-shell-permissions:
+	./ci/check-scripts-permissions.sh
+
 .PHONY: check-rust-formatting
 check-rust-formatting:
 	cargo fmt --all -- --check --config=group_imports=StdExternalCrate
 
-.PHONY: check-shell-formatting
-check-shell-formatting:
-	shfmt --simplify --diff ci/*
-
-.PHONY: check-yaml-formatting
-check-yaml-formatting:
-	yamlfmt -verbose -lint -dstar .github/workflows/*
-
 .PHONY: fix-rust-formatting
 fix-rust-formatting:
 	cargo fmt --all -- --config=group_imports=StdExternalCrate
 
+.PHONY: check-shell-formatting
+check-shell-formatting:
+	shfmt --simplify --diff ci/*
+
 .PHONY: fix-shell-formatting
 fix-shell-formatting:
 	shfmt --simplify --write ci/*
 
+.PHONY: check-yaml-formatting
+check-yaml-formatting:
+	yamlfmt -verbose -lint -dstar .github/workflows/*
+
 .PHONY: fix-yaml-formatting
 fix-yaml-formatting:
 	yamlfmt -verbose -dstar .github/workflows/*
@@ -46,9 +52,9 @@ check-shell-linting:
 check-github-actions-workflows-linting:
 	actionlint -verbose -color
 
-.PHONY: check-scripts-permissions
-check-scripts-permissions:
-	./ci/check-scripts-permissions.sh
+.PHONY: check-rust-dependencies
+check-rust-dependencies:
+	cargo machete
 
 .PHONY: compile
 compile:
@@ -60,6 +66,7 @@ unit-test:
 
 .PHONY: release
 release:
+	$(call check-musl-target)
 	cargo build --release --target=$(MUSL_TARGET) --locked --verbose
 
 .PHONY: publish-binary
diff --git a/flake.nix b/flake.nix
index 512784b..6868128 100644
--- a/flake.nix
+++ b/flake.nix
@@ -48,6 +48,8 @@
             pkgs.shellcheck
             # GitHub Actions workflows linting.
             pkgs.actionlint
+            # Rust dependencies check.
+            pkgs.cargo-machete
             # Deploying.
             pkgs.gh
           ];