Removes the backend and frontend logic that extracted compact titles
from reasoning/thinking blocks. The `Title` field on `ChatMessagePart`
remains for other part types (e.g. source), but reasoning blocks no
longer have titles derived from first-line markdown bold text or
provider metadata summaries.
**Backend:**
- Remove `ReasoningTitleFromFirstLine`, `reasoningTitleFromContent`,
`reasoningSummaryTitle`, `compactReasoningSummaryTitle`, and
`reasoningSummaryHeadline` from chatprompt
- Simplify `marshalContentBlock` to plain `json.Marshal` (no title
injection)
- Remove title tracking maps and `setReasoningTitleFromText` from
chatloop stream processing
- Remove `reasoningStoredTitle` from db2sdk
- Remove related tests from db2sdk_test
**Frontend:**
- Remove `mergeThinkingTitles` from blockUtils
- Simplify `appendTextBlock` to always merge consecutive thinking blocks
- Remove `applyStreamThinkingTitle` from streamState
- Simplify reasoning/thinking stream handler to ignore title-only parts
- Update tests accordingly
Net: **-487 lines / +42 lines**
Refactoring `ConvertState` is something we should eventually do. This PR
adds a golden file unit test for the output of `ConvertState` (even
errors).
That way if a refactor occurs, we can verify the output is unchanged for
our test cases.
## Summary
This PR updates the terraform/testdata by running
`provisioner/terraform/testdata/generate.sh` script. These changes occur
from `terraform-provider-coder`
[v2.4.2](https://github.com/coder/terraform-provider-coder/releases/tag/v2.4.2)
and are associated to the introduction of a `api_key_scope` optional
field with a default value:
https://github.com/coder/terraform-provider-coder/pull/391
## Changes
* Run `provisioner/terraform/testdata/generate.sh` script.
* Update `resource_test.go` to include `api_key_scope`
Kyle Carberry