Add implemented design proposals section

CONTRIBUTING.md

@@ -89,24 +89,23 @@ understood. Avoid introducing new 3-letter terms, which can be confused with 3-l
 [Terms currently in use](book/src/terminology.md)
 
 
-Proposing architectural changes
+Design Proposals
 ---
 
 Solana's architecture is described by a book generated from markdown files in
 the `book/src/` directory, maintained by an *editor* (currently @garious). To
-change the architecture, you'll need to at least propose a change the content
-under the [Proposed
-Changes](https://solana-labs.github.io/book-edge/proposals.html) chapter. Here's
-the full process:
+add a design proposal, you'll need to at least propose a change the content
+under the [Accepted Design
+Proposals](https://solana-labs.github.io/book-edge/proposals.html) chapter.
+Here's the full process:
 
-1. Propose to a change to the architecture by creating a PR that adds a
-   markdown document to the directory `book/src/` and references it from the
-   [table of contents](book/src/SUMMARY.md). Add the editor and any relevant
-   *maintainers* to the PR review.
+1. Propose a design by creating a PR that adds a markdown document to the
+   directory `book/src/` and references it from the [table of
+   contents](book/src/SUMMARY.md). Add any relevant *maintainers* to the PR review.
 2. The PR being merged indicates your proposed change was accepted and that the
-   editor and maintainers support your plan of attack.
+   maintainers support your plan of attack.
 3. Submit PRs that implement the proposal. When the implementation reveals the
-   need for tweaks to the architecture, be sure to update the proposal and have
+   need for tweaks to the proposal, be sure to update the proposal and have
    that change reviewed by the same people as in step 1.
-4. Once the implementation is complete, the editor will then work to integrate
-   the document into the book.
+4. Once the implementation is complete, submit a PR that moves the link from
+   the Accepted Proposals to the Implemented Proposals section.

book/src/SUMMARY.md

@@ -34,15 +34,14 @@
   - [JavaScript API](javascript-api.md)
   - [solana-wallet CLI](wallet.md)
 
-- [Proposed Architectural Changes](proposals.md)
+- [Accepted Design Proposals](proposals.md)
   - [Ledger Replication](ledger-replication-to-implement.md)
   - [Secure Vote Signing](vote-signing-to-implement.md)
   - [Staking Rewards](staking-rewards.md)
-  - [Passive Staking Delegation and Rewards](passive-stake-delegation-and-rewards.md)
+  - [Passive Stake Delegation and Rewards](passive-stake-delegation-and-rewards.md)
   - [Fork Selection](fork-selection.md)
   - [Reliable Vote Transmission](reliable-vote-transmission.md)
   - [Persistent Account Storage](persistent-account-storage.md)
-  - [Leader to Leader Transition](leader-leader-transition.md)
   - [Cluster Economics](ed_overview.md)
     - [Validation-client Economics](ed_validation_client_economics.md)
       - [State-validation Protocol-based Rewards](ed_vce_state_validation_protocol_based_rewards.md)
@@ -55,6 +54,9 @@
     - [Economic Sustainability](ed_economic_sustainability.md)
     - [Attack Vectors](ed_attack_vectors.md)
     - [References](ed_references.md)
-  - [Leader-to-Validator Transition](leader-validator-transition.md)
   - [Cluster Test Framework](cluster-test-framework.md)
   - [Testing Programs](testing-programs.md)
+
+- [Implemented Design Proposals](implemented-proposals.md)
+  - [Leader-to-Leader Transition](leader-leader-transition.md)
+  - [Leader-to-Validator Transition](leader-validator-transition.md)

book/src/implemented-proposals.md

@@ -0,0 +1,3 @@
+# Implemented Design Proposals
+
+The following design proposals are fully implemented.