[WIP] Refactor everything server to be more modular and use recommended APIs.

For tools where we seek to get some response from the server, renamed as an action, e.g., "Get Sum" rather than "Add" or "Get Annotated Message" rather than "Annotated Message", so that it's clear what the intent of the tool is in a quick review.

* Updated architecture.md

* Refactor/renamed add.ts to get-sum.ts
* Refactor/renamed annotated-message.ts to get-annotated-message.ts
* In tools/index.ts
  - sorted presentation order

src/everything/docs/architecture.md

@@ -43,14 +43,14 @@ src/everything
 │   └── streamableHttp.ts
 ├── tools
 │   ├── index.ts
-│   ├── add.ts
-│   ├── annotated-message.ts
 │   ├── echo.ts
+│   ├── get-annotated-message.ts
 │   ├── get-env.ts
 │   ├── get-tiny-image.ts
 │   ├── get-resource-links.ts
 │   ├── get-resource-reference.ts
 │   ├── get-structured-content.ts
+│   ├── get-sum.ts
 │   ├── long-running-operation.ts
 │   ├── sampling-request.ts
 │   ├── toggle-logging.ts
@@ -95,16 +95,16 @@ At `src/everything`:
   - index.ts
 
     - `registerTools(server)` orchestrator; delegates to basic tools and control tools.
-    - add.ts
-      - Registers an `add` tool with a Zod input schema that sums two numbers `a` and `b` and returns the result.
-    - annotated-message.ts
-      - Registers an `annotated-message` tool which demonstrates annotated content items by emitting a primary `text` message with `annotations` that vary by `messageType` (`"error" | "success" | "debug"`), and optionally includes an annotated `image` (tiny PNG) when `includeImage` is true.
     - echo.ts
       - Registers an `echo` tool that takes a message and returns `Echo: {message}`.
+    - get-annotated-message.ts
+        - Registers an `annotated-message` tool which demonstrates annotated content items by emitting a primary `text` message with `annotations` that vary by `messageType` (`"error" | "success" | "debug"`), and optionally includes an annotated `image` (tiny PNG) when `includeImage` is true.
     - get-env.ts
       - Registers a `get-env` tool that returns the current process environment variables as formatted JSON text; useful for debugging configuration.
     - get-tiny-image.ts
       - Registers a `get-tiny-image` tool, which returns a tiny PNG MCP logo as an `image` content item, along with surrounding descriptive `text` items.
+    - get-sum.ts
+        - Registers an `get-sum` tool with a Zod input schema that sums two numbers `a` and `b` and returns the result.
     - long-running-operation.ts
       - Registers a `long-running-operation` tool that simulates a long-running task over a specified `duration` (seconds) and number of `steps`; emits `notifications/progress` updates when the client supplies a `progressToken`.
     - sampling-request.ts
@@ -188,13 +188,13 @@ At `src/everything`:
 
 - Tools
 
-  - `add` (tools/add.ts): Adds two numbers `a` and `b` and returns their sum. Uses Zod to validate inputs.
-  - `annotated-message` (tools/annotated-message.ts): Returns a `text` message annotated with `priority` and `audience` based on `messageType` (`error`, `success`, or `debug`); can optionally include an annotated `image`.
   - `echo` (tools/echo.ts): Echoes the provided `message: string`. Uses Zod to validate inputs.
+  - `get-annotated-message` (tools/get-annotated-message.ts): Returns a `text` message annotated with `priority` and `audience` based on `messageType` (`error`, `success`, or `debug`); can optionally include an annotated `image`.
   - `get-env` (tools/get-env.ts): Returns all environment variables from the running process as pretty-printed JSON text.
   - `get-resource-links` (tools/get-resource-links.ts): Returns an intro `text` block followed by multiple `resource_link` items. For a requested `count` (1–10), alternates between dynamic Text and Blob resources using URIs from `resources/templates.ts`.
   - `get-resource-reference` (tools/get-resource-reference.ts): Accepts `resourceType` (`text` or `blob`) and `resourceId` (positive integer). Returns a concrete `resource` content block (with its `uri`, `mimeType`, and data) with surrounding explanatory `text`.
   - `get-structured-content` (tools/get-structured-content.ts): Demonstrates structured responses. Accepts `location` input and returns both backward‑compatible `content` (a `text` block containing JSON) and `structuredContent` validated by an `outputSchema` (temperature, conditions, humidity).
+  - `get-sum` (tools/get-sum.ts): For two numbers `a` and `b` calculates and returns their sum. Uses Zod to validate inputs.
   - `get-tiny-image` (tools/get-tiny-image.ts): Returns a tiny PNG MCP logo as an `image` content item with brief descriptive text before and after.
   - `long-running-operation` (tools/long-running-operation.ts): Simulates a multi-step operation over a given `duration` and number of `steps`; reports progress via `notifications/progress` when a `progressToken` is provided by the client.
   - `sampling-request` (tools/sampling-request.ts): Issues a `sampling/createMessage` request to the client/LLM using provided `prompt` and optional generation controls; returns the LLM’s response payload.