docs: give the README Trinity's own identity

The logo is the one already in use on the platform's other project, copied in
rather than reinterpreted: docs/assets/trinity-icon.png, resized from 1024px and
stripped of metadata, 1.5 MB down to 182 KB.

The wordmark is block letters on a 37x5 grid, emitted as one rectangle per run
of filled cells rather than as text. No font is involved, so it renders the same
wherever it is shown and stays sharp at any size, and the neon gradient is taken
from the logo so the two read as one mark. Horizontal and vertical runs are both
merged, because emitting a cell at a time left the glow filter scalloping the
edges of every stem.

Responsive by having two compositions rather than by hoping one scales. The wide
one carries outer padding; the narrow one, served under 600px by a picture
element, runs edge to edge, because on a phone the mark is scaled to the viewport
and padding is width the letters could have used. Checked at desktop and phone
widths, on GitHub's dark ground and on white, by rendering it in a browser rather
than by looking at the file.

The header also gains the badge row, the one-line statement of what Trinity is,
and links to the five documents a reader actually wants first: quick start,
architecture, security model, assurance case, roadmap.

Corrected while here: the status line said 25 slices and there are 26, since the
supply chain slice landed after that sentence was written.

Signed-off-by: Ayla Croft <aylacroft@proton.me>

Author: HackTuah

README.md

@@ -1,11 +1,36 @@
 <!-- SPDX-License-Identifier: Apache-2.0 -->
-# Trinity
+<div align="center">
+
+<img src="docs/assets/trinity-icon.png" alt="" width="132">
+
+<picture>
+  <source media="(max-width: 600px)" srcset="docs/assets/wordmark-sm.svg">
+  <img src="docs/assets/wordmark.svg" alt="TRINITY" width="520">
+</picture>
+
+### A personal AI agent that runs on your own machine
+
+It remembers you, learns procedures, acts through tools under a permission gate,<br>
+reaches you on whatever surface you are using, and does not lose your work when something crashes.
+
+<br>
 
 [![OpenSSF Best Practices](https://www.bestpractices.dev/projects/14772/badge)](https://www.bestpractices.dev/projects/14772)
+[![Gate](https://img.shields.io/github/actions/workflow/status/ScriptKittyOS/Trinity/gate.yml?branch=main&style=flat-square&label=gate&labelColor=1b2420&color=2ea043)](https://github.com/ScriptKittyOS/Trinity/actions/workflows/gate.yml)
+[![License](https://img.shields.io/badge/license-Apache--2.0-2ea043?style=flat-square&labelColor=1b2420)](LICENSE)
+[![Elixir](https://img.shields.io/badge/Elixir%20%2F%20OTP-on%20the%20BEAM-2ea043?style=flat-square&labelColor=1b2420)](#why-the-beam)
+
+<br>
+
+**[Quick start](#running-from-source)** &nbsp;·&nbsp;
+**[Architecture](docs/01-architecture.md)** &nbsp;·&nbsp;
+**[Security model](docs/07-security-model.md)** &nbsp;·&nbsp;
+**[Assurance case](docs/10-assurance-case.md)** &nbsp;·&nbsp;
+**[Roadmap](ROADMAP.md)**
+
+</div>
 
-A personal AI agent that runs on your own machine. It remembers you, learns procedures, acts
-through tools under a permission gate, reaches you on whatever surface you are using, and does
-not lose your work when something crashes.
+---
 
 Trinity is built on Elixir and the BEAM, with Phoenix LiveView for the interface, and ships as a
 desktop application. Apache-2.0, developed in the open from the first commit.
@@ -14,8 +39,9 @@ desktop application. Apache-2.0, developed in the open from the first commit.
 
 Pre-alpha, and usable from source. Milestones M0 to M4 are approved, **M5a Automates** with them
 (050, the scheduler; 059, the MCP measurement; 060, the MCP client; 061, the MCP server; 062, MCP
-authorization), and the first slice of M5b (070, the gateway core): 25 slices, each merged with a
-merge commit and tagged `slice/NNN` (`git tag -l 'slice/*' | wc -l` → 25, on 2026-09-23). What
+authorization), and the first slice of M5b (070, the gateway core), with 002 (the supply chain
+slice) beside them: 26 slices, each merged with a merge commit and tagged `slice/NNN`
+(`git tag -l 'slice/*' | wc -l` → 26, on 2026-09-23). What
 that means in practice:
 
 **Assessed against a recognised baseline.** Trinity holds the