docs: move the agent tool docs to 4-implementation/agent-tools

hive-forge/README.md

@@ -32,4 +32,4 @@ here.
   own notification read-state (no local mirror to drift).
 - **`body.rs`** — shared `--body`/`--body-file`/stdin resolution.
 
-Full verb reference: `docs/2-handbook/tools/forge.md`.
+Full verb reference: `docs/4-implementation/agent-tools/forge.md`.

hive-forge/src/main.rs

@@ -229,7 +229,7 @@ fn run() -> Result<()> {
     }
     // Same reasoning as `credential-helper` above: no repo, no forge
     // credentials — just a pure render of the clap tree the docs build
-    // pipes into `docs/2-handbook/tools/forge-cli.md`.
+    // pipes into `docs/4-implementation/agent-tools/forge-cli.md`.
     if let Verb::MarkdownDocs = verb {
         // `show_footer(false)`: the default footer's wording ("This
         // document was generated automatically by...") is clap-markdown's