Refactor apps-mcp to use CLI-based approach

This refactors the apps-mcp server to use CLI commands instead of direct
API providers, significantly simplifying the architecture and leveraging
existing bundle command functionality.

Major changes:

**New CLI-based provider:**
- Add experimental/apps-mcp/lib/providers/clitools package
- Implement workspace exploration via CLI commands
- Add invoke_databricks_cli helper for executing CLI commands
- Update prompts to support apps exploration workflow

**Removed providers and templates:**
- Remove databricks provider (replaced by CLI invocation)
- Remove IO provider (scaffolding/validation, now handled by bundle commands)
- Remove deployment provider (superseded by bundle deploy commands)
- Remove entire templates system including trpc template

**Clean up old development features:**
- Remove cmd/workspace/apps/dev.go and vite bridge
- Remove vite development server integration
- Drop experimental development workflow in favor of bundle-based approach

This change reduces code complexity by ~21k lines while providing a more
maintainable architecture that reuses existing CLI commands rather than
duplicating API logic.

Author: igrekun

acceptance/bundle/resource_deps/job_tasks/out.telemetry.direct.txt

@@ -7,3 +7,13 @@ Updating deployment state...
 Deployment complete!
 
 >>> print_telemetry_bool_values
+experimental.use_legacy_run_as false
+has_classic_interactive_compute false
+has_classic_job_compute false
+has_serverless_compute true
+presets_name_prefix_is_set false
+python_wheel_wrapper_is_set false
+resref_jobs.tags.* true
+resreferr_jobs.task true
+run_as_set false
+skip_artifact_cleanup false

acceptance/bundle/resource_deps/job_tasks/out.telemetry.terraform.txt

@@ -1,9 +1,4 @@
-if [ "$DATABRICKS_BUNDLE_ENGINE" == "direct" ]; then
-    # terraform has its own schema, direct uses bundle schema; here we replace TF syntax with bundle syntax:
-    update_file.py databricks.yml 'task[0].python_wheel_task[0].' 'tasks[0].python_wheel_task.'
-fi
-
 touch hello.whl
 trace $CLI bundle deploy
-trace print_telemetry_bool_values > out.telemetry.$DATABRICKS_BUNDLE_ENGINE.txt
+trace print_telemetry_bool_values
 rm out.requests.txt hello.whl

acceptance/bundle/resource_deps/job_tasks/out.test.toml

@@ -1 +1,4 @@
 RecordRequests = true
+
+# direct fails with Error: schema mismatch for ${resources.jobs.test_job.task[0].python_wheel_task[0].entry_point}: task: field "task" not found in resources.Job
+EnvMatrix.DATABRICKS_BUNDLE_ENGINE = ["terraform"]  # uses TF-specific syntax task[0].python_wheel_task[0]

acceptance/bundle/resource_deps/job_tasks/output.txt

@@ -0,0 +1,82 @@
+{
+  "plan": {
+    "resources.schemas.my": {
+      "action": "skip",
+      "remote_state": {
+        "browse_only": false,
+        "catalog_name": "main",
+        "catalog_type": "MANAGED_CATALOG",
+        "created_at": [UNIX_TIME_MILLIS][0],
+        "created_by": "[USERNAME]",
+        "full_name": "main.myschema-[UNIQUE_NAME]",
+        "name": "myschema-[UNIQUE_NAME]",
+        "owner": "[USERNAME]",
+        "updated_at": [UNIX_TIME_MILLIS][0],
+        "updated_by": "[USERNAME]"
+      }
+    },
+    "resources.volumes.bar": {
+      "depends_on": [
+        {
+          "node": "resources.schemas.my",
+          "label": "${resources.schemas.my.name}"
+        }
+      ],
+      "action": "skip",
+      "remote_state": {
+        "catalog_name": "main",
+        "created_at": [UNIX_TIME_MILLIS][1],
+        "created_by": "[USERNAME]",
+        "full_name": "main.myschema-[UNIQUE_NAME].volumebar-[UNIQUE_NAME]",
+        "name": "volumebar-[UNIQUE_NAME]",
+        "owner": "[USERNAME]",
+        "schema_name": "myschema-[UNIQUE_NAME]",
+        "storage_location": "s3://deco-uc-prod-isolated-aws-us-east-1/metastore/[UUID]/volumes/[UUID]",
+        "updated_at": [UNIX_TIME_MILLIS][1],
+        "volume_type": "MANAGED"
+      },
+      "changes": {
+        "remote": {
+          "storage_location": {
+            "action": "skip",
+            "reason": "server_side_default"
+          }
+        }
+      }
+    },
+    "resources.volumes.foo": {
+      "depends_on": [
+        {
+          "node": "resources.schemas.my",
+          "label": "${resources.schemas.my.name}"
+        },
+        {
+          "node": "resources.volumes.bar",
+          "label": "${resources.volumes.bar.storage_location}"
+        }
+      ],
+      "action": "skip",
+      "remote_state": {
+        "catalog_name": "main",
+        "comment": "s3://deco-uc-prod-isolated-aws-us-east-1/metastore/[UUID]/volumes/[UUID]",
+        "created_at": [UNIX_TIME_MILLIS][2],
+        "created_by": "[USERNAME]",
+        "full_name": "main.myschema-[UNIQUE_NAME].volumefoo-[UNIQUE_NAME]",
+        "name": "volumefoo-[UNIQUE_NAME]",
+        "owner": "[USERNAME]",
+        "schema_name": "myschema-[UNIQUE_NAME]",
+        "storage_location": "s3://deco-uc-prod-isolated-aws-us-east-1/metastore/[UUID]/volumes/[UUID]",
+        "updated_at": [UNIX_TIME_MILLIS][2],
+        "volume_type": "MANAGED"
+      },
+      "changes": {
+        "remote": {
+          "storage_location": {
+            "action": "skip",
+            "reason": "server_side_default"
+          }
+        }
+      }
+    }
+  }
+}

acceptance/bundle/resource_deps/job_tasks/script

@@ -0,0 +1,13 @@
+{
+  "plan": {
+    "resources.schemas.my": {
+      "action": "skip"
+    },
+    "resources.volumes.bar": {
+      "action": "skip"
+    },
+    "resources.volumes.foo": {
+      "action": "create"
+    }
+  }
+}

acceptance/bundle/resource_deps/job_tasks/test.toml

@@ -11,5 +11,6 @@ trap cleanup EXIT
 trace errcode $CLI bundle deploy &> out.deploy.$DATABRICKS_BUNDLE_ENGINE.txt
 print_requests.py --get //unity &> out.deploy.requests.$DATABRICKS_BUNDLE_ENGINE.json
 
-# Terraform could not deploy, so it still shows up here; direct shows no drift:
+# Should show empty plan for direct, but shows update in volumes.foo (permanent drift)
 $CLI bundle plan &> out.plan_after_deploy.$DATABRICKS_BUNDLE_ENGINE.txt
+$CLI bundle plan -o json &> out.plan_after_deploy.$DATABRICKS_BUNDLE_ENGINE.json

acceptance/bundle/resource_deps/remote_field_storage_location/out.plan_after_deploy.direct.json

@@ -1,3 +1,5 @@
+Badness = "Terraform cannot deploy; permanent drift in direct"
+
 Local = true
 Cloud = true
 RequiresUnityCatalog = true