= Triaxial Software Development Methodology (TSDM)
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TSDM is a three-dimensional governance framework designed for high-assurance, long-lived software systems. It ensures that every project decision is mapped across three critical axes: Planning, Maintenance, and Audit.

== The Three Axes

=== Axis 1: Planning (Scope Priority)
* **Must:** Non-negotiable core invariants and safety requirements.
* **Should:** Essential features and planned improvements.
* **Could:** Desired enhancements and future-proofing.

=== Axis 2: Maintenance (Execution Type)
* **Corrective:** Fixing bugs, vulnerabilities, and failures.
* **Adaptive:** Responding to environment or dependency changes.
* **Perfective:** Improving performance, refactoring, and documentation.

=== Axis 3: Audit (Verification Focus)
* **Systems:** Integrity of tools, infrastructure, and automation.
* **Compliance:** Adherence to standards, licenses, and verified seams.
* **Effects:** Real-world impact, ecological footprint, and user feedback.

== Integration

TSDM is the operational core of the Rhodium Standard. Every task in the `Justfile` and every state change in `STATE.a2ml` should be justifiable within this framework.
