ci: use Claude Opus 5.5 for bot workflows (#1003)

Signed-off-by: Vu Anh Phung <vu.phung@databricks.com>

Author: vuanhphung

.github/workflows/engineer-bot-followup.yml

@@ -150,7 +150,8 @@ jobs:
           PR_TITLE: ${{ github.event.pull_request.title }}
           PR_URL: ${{ github.event.pull_request.html_url }}
           TRIGGER_COMMENT_ID: ${{ github.event.comment.id }}
-          MODEL_ENDPOINT: https://${{ secrets.DATABRICKS_HOST }}/serving-endpoints/databricks-claude-opus-4-8/invocations
+          ENGINEER_BOT_MODEL_OVERRIDE: databricks-claude-opus-5-5
+          MODEL_ENDPOINT: https://${{ secrets.DATABRICKS_HOST }}/serving-endpoints/databricks-claude-opus-5-5/invocations
           DATABRICKS_TOKEN: ${{ secrets.DATABRICKS_TOKEN }}
           # NOTE: no live-warehouse connection env (DATABRICKS_SERVER_HOSTNAME /
           # DATABRICKS_HTTP_PATH / DATABRICKS_CATALOG / DATABRICKS_USER) is wired

.github/workflows/engineer-bot-learning.yml

@@ -106,8 +106,9 @@ jobs:
           # translate_endpoint's already-v2 early-return, which keeps the trailing
           # `invocations`, so the CLI appends `/v1/messages` →
           # `.../anthropic/invocations/v1/messages` → HTTP 400 (unsupported path).
-          # The effective model is set by the engine default (no retrospective.model).
-          MODEL_ENDPOINT: https://${{ secrets.DATABRICKS_HOST }}/serving-endpoints/databricks-claude-opus-4-8/invocations
+          # The engine adds the [1m] context suffix to the override.
+          ENGINEER_BOT_MODEL_OVERRIDE: databricks-claude-opus-5-5
+          MODEL_ENDPOINT: https://${{ secrets.DATABRICKS_HOST }}/serving-endpoints/databricks-claude-opus-5-5/invocations
           DATABRICKS_TOKEN: ${{ secrets.DATABRICKS_TOKEN }}
           RUNNER_TEMP: ${{ runner.temp }}
           SINCE: ${{ inputs.since }}

.github/workflows/engineer-bot.yml

@@ -219,7 +219,8 @@ jobs:
         # .bot/config.yaml `flow:` default (no/other type, or type-set-late case).
         working-directory: ${{ runner.temp }}
         env:
-          MODEL_ENDPOINT: https://${{ secrets.DATABRICKS_HOST }}/serving-endpoints/databricks-claude-opus-4-8/invocations
+          ENGINEER_BOT_MODEL_OVERRIDE: databricks-claude-opus-5-5
+          MODEL_ENDPOINT: https://${{ secrets.DATABRICKS_HOST }}/serving-endpoints/databricks-claude-opus-5-5/invocations
           DATABRICKS_TOKEN: ${{ secrets.DATABRICKS_TOKEN }}
           # Live-warehouse connection env for the agent's REQUIRED E2E repro test
           # (see .bot/prompts/engineer/system.md — the bug-fix flow reproduces the

.github/workflows/reviewer-bot-followup.yml

@@ -89,7 +89,8 @@ jobs:
           TRIGGER_COMMENT_ID: ${{ github.event.comment.id }}
           HEAD_SHA: ${{ github.event.pull_request.head.sha }}
           PR_BASE_SHA: ${{ github.event.pull_request.base.sha }}
-          MODEL_ENDPOINT: https://${{ secrets.DATABRICKS_HOST }}/serving-endpoints/databricks-claude-opus-4-8/invocations
+          REVIEWER_BOT_MODEL_OVERRIDE: databricks-claude-opus-5-5
+          MODEL_ENDPOINT: https://${{ secrets.DATABRICKS_HOST }}/serving-endpoints/databricks-claude-opus-5-5/invocations
           DATABRICKS_TOKEN: ${{ secrets.DATABRICKS_TOKEN }}
           DRY_RUN: 'false'
           RUNNER_TEMP: ${{ runner.temp }}

.github/workflows/reviewer-bot.yml

@@ -116,7 +116,8 @@ jobs:
           PR_NUMBER: ${{ steps.inputs.outputs.pr_number }}
           HEAD_SHA: ${{ steps.inputs.outputs.head_sha }}
           DRY_RUN: ${{ steps.inputs.outputs.dry_run }}
-          MODEL_ENDPOINT: https://${{ secrets.DATABRICKS_HOST }}/serving-endpoints/databricks-claude-opus-4-8/invocations
+          REVIEWER_BOT_MODEL_OVERRIDE: databricks-claude-opus-5-5
+          MODEL_ENDPOINT: https://${{ secrets.DATABRICKS_HOST }}/serving-endpoints/databricks-claude-opus-5-5/invocations
           DATABRICKS_TOKEN: ${{ secrets.DATABRICKS_TOKEN }}
           RUNNER_TEMP: ${{ runner.temp }}
           # The reviewer's repo-specific ADDITIVE guidance, read from the TRUSTED