entropydepth: complete spec, example, tests, and guidelines (#19)

* docs: clarify minimal_run example and remove executable placeholders

* entropydepth: add invariant spec, example, tests, referee overview, contribution rules

Author: inaciovasquez2020

.github/workflows/verify.yml

@@ -0,0 +1,6 @@
+
+      - name: EntropyDepth invariant guard
+        run: |
+          test -f docs/ENTROPY_DEPTH_SPEC.md
+          test -f docs/REFEREE_OVERVIEW.md
+          test -f CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing to Chronos–EntropyDepth
+
+## Rules
+- Document new invariants in docs/ENTROPY_DEPTH_SPEC.md.
+- Add tests for any semantic extension.
+- Maintain green CI.
+
+## Allowed
+- Examples and documentation
+- CI improvements
+- Invariant clarifications
+
+## Disallowed
+- Changes that affect entropy depth semantics without spec updates

docs/ENTROPY_DEPTH_SPEC.md

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+# Chronos–EntropyDepth Invariant Specification
+
+## Purpose
+This document specifies the structural and numeric invariants
+associated with the Chronos EntropyDepth module.
+
+## Invariants
+- EntropyDepth bound must be well-defined for all valid inputs.
+- Output of the Chronos engine shall preserve URF Spine normalization.
+- Deterministic structured output is required.
+
+## Scope
+This invariant applies to:
+- canonical inputs
+- integration with URF Spine and verifier pipelines

docs/REFEREE_OVERVIEW.md

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+# Chronos–EntropyDepth – Referee Overview
+
+This repository encapsulates the entropy depth invariants and logic of
+the Chronos engine. It provides high-level structure and numerical
+constraints that feed into downstream verification.
+
+It does not introduce new theory beyond the Chronos conceptual model,
+but makes these invariants explicit and testable.

docs/chronos_macros.tex

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+% =========================
+% Chronos Global Macros
+% =========================
+
+\newcommand{\RR}{\mathbb{R}}
+\newcommand{\dd}{\,\mathrm{d}}
+
+\newcommand{\ED}{\mathrm{ED}}
+
+\newcommand{\DT}{\mathcal{D}}
+\newcommand{\DTover}{\overline{\mathcal{D}}}
+
+\newcommand{\KT}{K_T}
+\newcommand{\Lsurr}{L}
+

examples/minimal_run.md

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+# Minimal Chronos–EntropyDepth Workflow
+
+1. Construct minimal valid input set.
+2. Run Chronos EntropyDepth engine:
+```textn<chronos command invocation placeholder>n```

verify/tests/test_spec_and_example.py

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+from pathlib import Path
+
+def test_spec_exists():
+    assert Path("docs/ENTROPY_DEPTH_SPEC.md").exists()
+
+def test_example_exists():
+    assert Path("examples/minimal_run.md").exists()