docs(agent): document provider base bottles

Assisted-by: Codex

examples/bottles/claude.md

@@ -0,0 +1,16 @@
+---
+agent_provider:
+  template: claude
+
+egress:
+  routes:
+    - host: api.anthropic.com
+      role: claude_code_oauth
+      auth:
+        scheme: Bearer
+        token_ref: BOT_BOTTLE_OAUTH_TOKEN
+---
+
+Common Claude provider boundary. Drop this file into
+`~/.bot-bottle/bottles/claude.md`, then extend it from task-specific
+bottles.

examples/bottles/dev.md

@@ -1,38 +1,13 @@
 ---
+extends: claude
+
 env:
   GIT_AUTHOR_NAME: Eric Diderich
   NODE_ENV: development
-
-cred_proxy:
-  routes:
-    - path: /anthropic/
-      upstream: https://api.anthropic.com
-      auth_scheme: Bearer
-      token_ref: BOT_BOTTLE_OAUTH_TOKEN
-      role: anthropic-base-url
-    - path: /gh-api/
-      upstream: https://api.github.com
-      auth_scheme: Bearer
-      token_ref: GH_PAT
-    - path: /gh-git/
-      upstream: https://github.com
-      auth_scheme: Bearer
-      token_ref: GH_PAT
-      role: git-insteadof
-    - path: /gitea/dideric/
-      upstream: https://gitea.dideric.is
-      auth_scheme: token
-      token_ref: GITEA_TOKEN
-      role: [git-insteadof, tea-login]
-    - path: /npm/
-      upstream: https://registry.npmjs.org
-      auth_scheme: Bearer
-      token_ref: NPM_TOKEN
-      role: npm-registry
 ---
 
 The `dev` bottle — backs a generic development workflow.
 
-Holds tokens for Anthropic, GitHub, a self-hosted Gitea, and npm.
-Drop this file into `~/.bot-bottle/bottles/dev.md` and any agent
-referencing `bottle: dev` will launch against this infrastructure.
+Inherits the Claude provider boundary from `claude`. Drop this file
+into `~/.bot-bottle/bottles/dev.md` and any agent referencing
+`bottle: dev` will launch against this infrastructure.