chore: standardize .gitignore (RSR)

Author: hyperpolymath

.gitignore

@@ -1,47 +1,79 @@
-# Rust build artifacts
-/target/
-**/*.rs.bk
-Cargo.lock
+# SPDX-License-Identifier: AGPL-3.0-or-later
+# RSR-compliant .gitignore
+
+# OS & Editor
+.DS_Store
+Thumbs.db
+*.swp
+*.swo
+*~
+.idea/
+.vscode/
 
-# Distribution/build outputs
+# Build
+/target/
+/_build/
+/build/
 /dist/
+/out/
 
-# Secrets and keys (NEVER commit these!)
-*.key
-*.pem
-infra/nebula/*.key
-infra/nebula/*.crt
-!infra/nebula/.gitkeep
+# Dependencies
+/node_modules/
+/vendor/
+/deps/
+/.elixir_ls/
 
-# Environment files
-.env
-.env.*
-!.env.example
+# Rust
+# Cargo.lock  # Keep for binaries
 
-# Editor/IDE
-.vscode/
-.idea/
-*.swp
-*.swo
-*~
+# Elixir
+/cover/
+/doc/
+*.ez
+erl_crash.dump
 
-# OS files
-.DS_Store
-Thumbs.db
+# Julia
+*.jl.cov
+*.jl.mem
+/Manifest.toml
+
+# ReScript
+/lib/bs/
+/.bsb.lock
+
+# Python (SaltStack only)
+__pycache__/
+*.py[cod]
+.venv/
+
+# Ada/SPARK
+*.ali
+/obj/
+/bin/
 
-# Variable files with secrets
-vars/*.json
-!vars/example.json
+# Haskell
+/.stack-work/
+/dist-newstyle/
+
+# Chapel
+*.chpl.tmp.*
+
+# Secrets
+.env
+.env.*
+*.pem
+*.key
+secrets/
+
+# Test/Coverage
+/coverage/
+htmlcov/
 
 # Logs
 *.log
-logs/
+/logs/
 
-# Temporary files
+# Temp
+/tmp/
 *.tmp
-*.temp
-.cache/
-
-# Coverage reports
-tarpaulin-report.html
-coverage/
+*.bak