Add v1 design brief bundle and sort .gitignore alphabetically

Adds docs/brief/ containing the 10-file OPSM v1 design brief bundle
(master brief, vision, architecture, scope, data model, trust model,
plugin policy, implementation phasing, and coding AI handoff). Sorts
.gitignore sections alphabetically and reorders section groups A-Z.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: hyperpolymath

.gitignore

@@ -1,88 +1,88 @@
 # SPDX-License-Identifier: PMPL-1.0-or-later
 # RSR-compliant .gitignore
 
-# OS & Editor
-.DS_Store
-Thumbs.db
-*.swp
-*.swo
-*~
-.idea/
-.vscode/
+# Ada/SPARK
+*.ali
+/bin/
+/obj/
 
 # Build
-/target/
 /_build/
 /build/
 /dist/
 /out/
+/target/
+
+# Chapel
+*.chpl.tmp.*
+
+# Crash recovery artifacts
+ai-cli-crash-capture/
 
 # Dependencies
+/.elixir_ls/
+/deps/
 /node_modules/
 /vendor/
-/deps/
-/.elixir_ls/
-
-# Rust
-# Cargo.lock  # Keep for binaries
 
 # Elixir
+*.ez
 /cover/
 /doc/
-*.ez
 erl_crash.dump
 
+# Haskell
+/.stack-work/
+/dist-newstyle/
+
 # Julia
 *.jl.cov
 *.jl.mem
 /Manifest.toml
 
-# ReScript
-/lib/bs/
-/.bsb.lock
-*.ast
-*.cmt
+# Logs
+*.log
+/logs/
+
+# NIF build artifacts
+opsm_ex/native/*/Cargo.lock
+opsm_ex/priv/native/
+
+# OS & Editor
+*.swo
+*.swp
+*~
+.DS_Store
+.idea/
+.vscode/
+Thumbs.db
 
 # Python (SaltStack only)
-__pycache__/
 *.py[cod]
 .venv/
+__pycache__/
 
-# Ada/SPARK
-*.ali
-/obj/
-/bin/
-
-# Haskell
-/.stack-work/
-/dist-newstyle/
+# ReScript
+*.ast
+*.cmt
+/.bsb.lock
+/lib/bs/
 
-# Chapel
-*.chpl.tmp.*
+# Rust
+# Cargo.lock  # Keep for binaries
 
 # Secrets
+*.key
+*.pem
 .env
 .env.*
-*.pem
-*.key
 secrets/
 
+# Temp
+*.bak
+*.tmp
+/tmp/
+
 # Test/Coverage
 /coverage/
 htmlcov/
-
-# Logs
-*.log
-/logs/
-
-# NIF build artifacts
-opsm_ex/native/*/Cargo.lock
-opsm_ex/priv/native/
-
-# Crash recovery artifacts
-ai-cli-crash-capture/
-
-# Temp
-/tmp/
-*.tmp
-*.bak