Expand design philosophy documentation

docs/DESIGN-PHILOSOPHY.md

@@ -1,24 +1,30 @@
 # ChronoSeal Design Philosophy
 
-**"Files as a Software" (FaaS) — Everything is a file.**
+**"Everything is a File" — Unix-Native Software Design**
 
-ChronoSeal is intentionally designed as a **first-class citizen of Linux**. The entire application behaves as if it is a well-designed native file in the Unix filesystem.
+ChronoSeal is intentionally built as a **first-class citizen of Linux**. The entire application is designed to behave like a well-engineered native file within the Unix filesystem.
 
-### Core Beliefs
+### Why This Philosophy Matters
 
-- The CLI is the single source of truth.
+ChronoSeal is designed so that administrators can operate, monitor, configure, and integrate it using the same reliable, transparent, and trusted tools and patterns they already use on Linux systems — without fighting the operating environment.
-- The application must be controllable, inspectable, configurable, and composable using standard Unix tools.
-- Any GUI, TUI, or web interface is only a thin wrapper.
-- Production robustness and decades-long maintainability take precedence over rapid development.
 
-### Key Principles Applied
+### Core Principles
 
-- **Behave like a file**: Clear interface, predictable behavior, proper lifecycle (open/read/write/close semantics via signals and commands).
+- **Everything is a File**: The application must be controllable, inspectable, and composable through standard Unix interfaces (CLI, files, signals, pipes, and environment).
-- **Composability**: Works naturally with pipes, redirection, systemd, scripts, and orchestration tools.
+- **CLI as Source of Truth**: All operations — starting, stopping, configuring, monitoring, and debugging — must be possible from the command line with excellent discoverability.
-- **Observability**: Everything important is exposed as text or structured data.
+- **Behave Like a Native File**: Predictable lifecycle management through commands, signals (`SIGHUP`, `SIGTERM`, `SIGUSR1`), logs, configuration files, and standard process semantics.
-- **Minimal Friction**: One-line installer, excellent `--help`, proper man pages.
+- **Composability**: Must work naturally with pipes, redirection, scripts, systemd, Ansible, Docker, and orchestration tools.
-- **Respect for the OS**: Follows FHS, XDG, systemd best practices, and hardened security model.
+- **Observability by Default**: All important state and metrics should be accessible as text or structured data.
+- **Minimal Friction, Maximum Durability**: One-line installer, world-class `--help`, proper man pages, and decades-long maintainability are non-negotiable.
+- **Respect for the OS**: Follows Linux Filesystem Hierarchy Standard (FHS), XDG Base Directory specification, and hardened systemd practices.
 
-This philosophy guided the complete refactoring of ChronoSeal.
+### Development Mindset
 
-**Status**: Core architecture and systemd integration completed. Rich CLI, configuration system, and installer are in progress.
+- Production robustness, security, and long-term sustainability take clear precedence over development speed.
+- Any GUI, TUI, or web dashboard must be thin wrappers around the core CLI and interfaces.
+- Every design decision is evaluated against one question:  
+  **“Does this make ChronoSeal feel like it naturally belongs in `/usr/bin/`?”**
+
+This philosophy guided the complete refactoring of ChronoSeal and continues to drive all future development.
+
+**Status**: Core architecture and systemd integration completed. Rich CLI, runtime configuration system, and one-line installer are in active development.