docs: remove project-status checklist (#34)

diff --git a/README.md b/README.md
index 8085e8d..7c0caeb 100644
--- a/README.md
+++ b/README.md

@@ -43,7 +43,7 @@
 build steps):
 
 - [User guide](docs/source/user-guide/index.md) — installation, the
-  DataFrame and SQL APIs, Parquet ingestion, project status.
+  DataFrame and SQL APIs, Parquet ingestion.
 - [Contributor guide](docs/source/contributor-guide/index.md) — build,
   test, code style, and how to bump the DataFusion version.
 

diff --git a/docs/source/user-guide/dataframe.md b/docs/source/user-guide/dataframe.md
index e91eab7..b019e96 100644
--- a/docs/source/user-guide/dataframe.md
+++ b/docs/source/user-guide/dataframe.md

@@ -35,8 +35,8 @@
 
 ## DataFrame transformations
 
-The DataFrame API exposes `select` and `filter` today. Other
-transformations are TBD — see [Project status](project-status.md).
+The DataFrame API exposes `select`, `filter`, `limit`, `distinct`,
+`dropColumns`, and `withColumnRenamed`.
 
 ```java
 try (DataFrame df = ctx.readParquet("/path/to/orders.parquet")) {

diff --git a/docs/source/user-guide/index.md b/docs/source/user-guide/index.md
index 50e41d7..2f32499 100644
--- a/docs/source/user-guide/index.md
+++ b/docs/source/user-guide/index.md

@@ -37,7 +37,6 @@
 dataframe
 parquet
 proto-plans
-project-status
 api-reference
 ```
 

diff --git a/docs/source/user-guide/project-status.md b/docs/source/user-guide/project-status.md
deleted file mode 100644
index 82154ea..0000000
--- a/docs/source/user-guide/project-status.md
+++ /dev/null

@@ -1,49 +0,0 @@
-<!--
-Licensed to the Apache Software Foundation (ASF) under one
-or more contributor license agreements.  See the NOTICE file
-distributed with this work for additional information
-regarding copyright ownership.  The ASF licenses this file
-to you under the Apache License, Version 2.0 (the
-"License"); you may not use this file except in compliance
-with the License.  You may obtain a copy of the License at
-
-  http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing,
-software distributed under the License is distributed on an
-"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
-KIND, either express or implied.  See the License for the
-specific language governing permissions and limitations
-under the License.
--->
-
-# Project status
-
-A snapshot of what works today. The library is in early development; the
-API will change before the first release.
-
-## Query interfaces
-
-- [x] SQL: `SessionContext.sql(String)`
-- [x] DataFrame: `select`, `filter` (other transformations TBD)
-- [x] DataFusion-Proto `LogicalPlanNode`: `SessionContext.fromProto(byte[])`.
-      The `datafusion-proto` Java classes are generated by the build.
-
-## Data sources
-
-- [x] Parquet via `registerParquet` / `readParquet`, with `ParquetReadOptions`
-- [x] CSV via `registerCsv` / `readCsv`, with `CsvReadOptions`
-- [ ] JSON, Avro
-- [ ] Custom catalog and table providers
-
-## Results
-
-- [x] `DataFrame.collect(allocator)` — Arrow C Data Interface stream
-- [x] `DataFrame.count()`, `show()`, `show(int)`
-- [x] `SessionContext.tableSchema(String)`
-
-## Not yet
-
-- [ ] `SessionConfig` / `RuntimeEnv` knobs
-- [ ] Java UDFs
-- [ ] `write_*` outputs

diff --git a/docs/source/user-guide/sessioncontext.md b/docs/source/user-guide/sessioncontext.md
index 14111b8..818ee0e 100644
--- a/docs/source/user-guide/sessioncontext.md
+++ b/docs/source/user-guide/sessioncontext.md

@@ -40,9 +40,23 @@
 without external synchronization. The simplest pattern is one context per
 thread.
 
-## What's configurable today
+## Configuration
 
-Today, `SessionContext` exposes only data-source registration and query
-construction. Tuning knobs that DataFusion offers natively
-(`SessionConfig`, `RuntimeEnv`) are not yet wired through the Java API.
-See [Project status](project-status.md) for the current shape of the API.
+`SessionContext.builder()` exposes a fluent builder for overriding
+DataFusion defaults — batch size, target partitions, statistics
+collection, information schema, memory pool size, and the spill
+directory. See the
+<!-- Raw HTML link: MyST resolves relative .html Markdown links as
+     cross-references, which fails sphinx-build -W. The Javadoc tree is
+     copied verbatim via html_extra_path and is unknown to Sphinx. -->
+<a href="../api/org/apache/datafusion/SessionContextBuilder.html"><code>SessionContextBuilder</code></a>
+Javadoc for the full list.
+
+```java
+try (SessionContext ctx = SessionContext.builder()
+        .batchSize(4096)
+        .targetPartitions(8)
+        .build()) {
+    // ...
+}
+```