chore(config): bump default amazon-bedrock model to claude-sonnet-5

DEFAULT_MODELS[amazon-bedrock] -> amazon-bedrock/global.anthropic.claude-sonnet-5
(was global.anthropic.claude-sonnet-4-5-20250929-v1:0). Verified invokable via
pi --list-models. Folded into the existing Unreleased changelog entry; openai
(gpt-5.4) default unchanged.

CHANGELOG.md

@@ -10,13 +10,16 @@ Tags follow **independent semver** (since `v2.0.0`) — they version *this image
 
 ### Changed
 
-- **Default Anthropic model bumped to `claude-sonnet-5`** (was
-  `claude-sonnet-4-6`). Updated `DEFAULT_MODELS["anthropic"]` in
-  `rootfs/usr/local/lib/opencode-devbox/generate-config.py` (which also feeds
-  `FALLBACK_MODEL`) and the commented `OPENCODE_MODEL` example in `.env.example`.
-  Takes effect for new containers when `OPENCODE_PROVIDER=anthropic` and no
-  explicit `OPENCODE_MODEL` override is set. The `openai` and `amazon-bedrock`
-  provider defaults are unchanged.
+- **Default models bumped to `claude-sonnet-5`.** In
+  `rootfs/usr/local/lib/opencode-devbox/generate-config.py`,
+  `DEFAULT_MODELS["anthropic"]` → `anthropic/claude-sonnet-5` (was
+  `claude-sonnet-4-6`; also feeds `FALLBACK_MODEL`) and
+  `DEFAULT_MODELS["amazon-bedrock"]` →
+  `amazon-bedrock/global.anthropic.claude-sonnet-5` (was
+  `...claude-sonnet-4-5-20250929-v1:0`). Also updates the commented
+  `OPENCODE_MODEL` example in `.env.example`. Takes effect for new containers
+  when no explicit `OPENCODE_MODEL` override is set. The `openai` default
+  (`gpt-5.4`) is unchanged.
 
 ## v2.7.0 — 2026-07-13