docs(planning): file the two defects deferred from the access-log fix (#163)

Both were found while fixing the Litestar access-log body leak (#162) and kept
out of it to leave a security fix unencumbered.

- log_stream binds sys.stdout at import, so structlog output ignores a stdout
  the process rebinds before bootstrap, while the root-logger handler follows
  it (lightweight lane).
- Litestar.from_config() skips the request_max_body_size default that
  Litestar.__init__ applies, so every body-reading handler returns 500 unless
  the caller sets the field themselves (full lane). Reported upstream as
  litestar-org/litestar#4296.

Author: lesnik512

planning/changes/2026-08-10.02-log-stream-bind-at-bootstrap.md

@@ -0,0 +1,74 @@
+---
+summary: Resolve `_MemoryLoggerFactoryConfig.log_stream` at bootstrap instead of at import, so structlog output follows a stdout the process rebinds after importing `lite_bootstrap` (the root-logger handler already does).
+---
+
+# Change: Bind the memory logger's stream at bootstrap, not at import
+
+**Lane:** lightweight — ≲30 LOC net, ≤2 files, no new file, no public-API
+change, a single straightforward test.
+
+## Goal
+
+`_MemoryLoggerFactoryConfig.log_stream` (`lite_bootstrap/instruments/logging_factory.py`)
+defaults to a bare `sys.stdout`, evaluated once when the module is imported.
+Every `MemoryLoggerFactory` handler therefore writes to whatever `sys.stdout`
+was at import time, even when the process rebinds `sys.stdout` before
+bootstrapping. Resolve it at bootstrap instead.
+
+## Approach
+
+```python
+log_stream: typing.Any = dataclasses.field(default_factory=lambda: sys.stdout)
+```
+
+The config is constructed in `LoggingInstrument.memory_logger_factory`, so a
+`default_factory` moves the lookup to bootstrap time — the same moment
+`_configure_foreign_loggers` already binds its root-logger
+`logging.StreamHandler(sys.stdout)`. Today the two disagree: the root handler
+follows a rebound stdout and the structlog path does not.
+
+Observed with a plain `FreeBootstrapper` (all bootstrappers share
+`LoggingInstrument`, so this is not Litestar-specific):
+
+```python
+with contextlib.redirect_stdout(buffer):
+    FreeBootstrapper(bootstrap_config=FreeConfig(service_name="svc", logging_buffer_capacity=0)).bootstrap()
+    structlog.get_logger("demo").info("hello after redirect")
+# buffer is empty; the line went to the real stdout instead
+```
+
+Two consequences worth naming. In production, anything that wraps or replaces
+`sys.stdout` after import — `contextlib.redirect_stdout`, a supervisor that
+re-points the stream, a test harness — is silently bypassed by structlog output
+while stdlib output follows along. In this repo's own test suite it is why
+neither `capsys` nor `capfd` can observe structlog lines (pytest installs its
+capture before collection imports the module), which forced
+`tests/test_litestar_bootstrap.py` to record through a handler attached to the
+`litestar` logger. That workaround stays either way; it is independent of the
+capture mechanism, which is the point of it.
+
+Behavior is unchanged for the ordinary case, where nothing rebinds `sys.stdout`
+between import and bootstrap.
+
+## Files
+
+- `lite_bootstrap/instruments/logging_factory.py` — `log_stream` gains a `default_factory`.
+- `tests/instruments/test_logging_instrument.py` — test added.
+
+## Verification
+
+- [ ] Failing test first: bootstrap a `FreeBootstrapper` inside
+      `contextlib.redirect_stdout(io.StringIO())`, log one line, assert it lands
+      in the buffer. Command: `just test -k "log_stream"`. Expected failure: the
+      buffer is empty because the line went to the import-time stdout.
+- [ ] Apply the change.
+- [ ] Test passes — `just test -k "log_stream"`.
+- [ ] `just test` — full suite green, coverage still 100%.
+- [ ] `just lint` — clean.
+
+## Notes
+
+Found while fixing the Litestar access-log body leak
+(`planning/changes/2026-08-10.01-litestar-middleware-logging.md`), which is
+where the test-capture consequence is documented. Deliberately left out of that
+change to keep a security fix unencumbered.

planning/changes/2026-08-10.03-litestar-request-max-body-size.md

@@ -0,0 +1,133 @@
+---
+summary: Fill `request_max_body_size` with Litestar's own 10 MB default when the bootstrapped `AppConfig` leaves it `Empty`, so body-reading handlers stop returning 500 under `Litestar.from_config()`, and pin the constant against Litestar's signature so an upstream change fails CI.
+---
+
+# Design: Apply Litestar's request_max_body_size default when the AppConfig leaves it unset
+
+## Summary
+
+`LitestarBootstrapper` builds its application with `Litestar.from_config()`,
+which — unlike `Litestar(...)` — does not apply the 10 MB
+`request_max_body_size` default. An `AppConfig` that leaves the field at
+`Empty` therefore yields an application where every handler that reads a
+request body returns 500. Fill the field in the bootstrapper when, and only
+when, it is `Empty`.
+
+## Motivation
+
+Reproduced on litestar 2.24.0:
+
+```python
+app = litestar.Litestar(route_handlers=[echo])  # request_max_body_size == 10_000_000
+app = litestar.Litestar.from_config(AppConfig(...))  # request_max_body_size is Empty
+```
+
+With the second form, a `POST` to a handler taking `data: dict` returns 500:
+
+```
+ImproperlyConfiguredException: 500: 'request_max_body_size' set to 'Empty' on all layers.
+To omit a limit, set 'request_max_body_size=None'
+```
+
+`LitestarConfig.application_config` defaults to a bare `AppConfig()`, and a
+caller who supplies their own `AppConfig` hits the same default, so **the
+failure is the norm rather than the edge case**: any lite-bootstrap Litestar
+service whose handlers accept a body 500s unless the caller happens to know to
+set `request_max_body_size` themselves. It is not per-route recoverable either
+— the exception is raised while resolving the layered value, so the only fixes
+are on the handler, a router, or the app.
+
+Found while fixing the access-log body leak
+(`planning/changes/2026-08-10.01-litestar-middleware-logging.md`), whose tests
+work around it with `request_max_body_size=1000` on their handlers. That
+workaround is what should disappear.
+
+## Design
+
+`LitestarBootstrapper._apply_config` already owns exactly this job — it is the
+one place that mutates the caller's `AppConfig` before
+`Litestar.from_config()` runs, setting `debug` and appending the teardown hook.
+Add the fill there:
+
+```python
+# litestar_bootstrapper.py, module level
+# Litestar.from_config() skips the default that Litestar.__init__ applies, leaving the
+# field Empty and 500-ing every body-reading handler. Pinned by a guard test.
+_LITESTAR_DEFAULT_REQUEST_MAX_BODY_SIZE: typing.Final = 10_000_000
+```
+
+```python
+    def _apply_config(self, application_config: "AppConfig") -> None:
+        application_config.debug = self.bootstrap_config.service_debug
+        if application_config.request_max_body_size is Empty:
+            application_config.request_max_body_size = _LITESTAR_DEFAULT_REQUEST_MAX_BODY_SIZE
+        application_config.on_shutdown.append(self.teardown)
+```
+
+`Empty` is an enum member (`litestar.types.Empty`, `_EmptyEnum.EMPTY`), not a
+class, so the check is an identity comparison — `isinstance` would raise.
+`Empty` joins the existing `if import_checker.is_litestar_installed:` import
+block.
+
+The guard is the `is Empty` test: a caller's own value, including an explicit
+`None` (Litestar's "no limit"), is left alone. Only the unset case is filled.
+
+**Pinning the constant.** Litestar exposes no public constant for the default;
+the value lives only in `Litestar.__init__`'s signature, so hardcoding it can
+drift silently on a Litestar bump. A guard test reads the signature default and
+asserts it equals our constant, turning a drift into a CI failure rather than a
+behavior change nobody notices. Runtime introspection was rejected: it makes
+every bootstrap depend on a parameter name Litestar does not publish as API,
+and it fails opaquely if that name changes.
+
+**Upstream.** `Litestar.from_config()` diverging from `Litestar(...)` on a
+constructor default is already reported as
+[litestar-org/litestar#4296](https://github.com/litestar-org/litestar/issues/4296),
+which lists five such mismatches; our reproduction and the reason this one is a
+hard failure rather than a cosmetic difference are in
+[a comment there](https://github.com/litestar-org/litestar/issues/4296#issuecomment-5243196116).
+`from_config` passes every `AppConfig` field explicitly
+(`cls(**dict(extract_dataclass_items(config)))`), so an `__init__` default can
+never apply — and on 2.24.0 `request_max_body_size` is the only field where
+`AppConfig()` is `Empty` while `__init__` has a real default. If upstream fixes
+it, the `is Empty` branch simply stops firing and the guard test keeps the
+constant honest until the fill can be dropped.
+
+## Non-goals
+
+- Exposing `request_max_body_size` as a `LitestarConfig` field. Callers who
+  want a non-default limit set it on their own `AppConfig`, which is where
+  every other Litestar app-level knob already lives.
+- Auditing the other `AppConfig` fields where `from_config()` may diverge from
+  `Litestar.__init__`. If more turn up, they get their own change.
+
+## Testing
+
+`just test -k "request_max_body_size"`, in `tests/test_litestar_bootstrap.py`:
+
+- a bootstrapped app with a body-reading handler and no explicit
+  `request_max_body_size`: `POST` succeeds (today: 500).
+- a caller-supplied value survives: `AppConfig(request_max_body_size=42)`
+  bootstraps to `42`.
+- an explicit `None` (Litestar's no-limit form) survives as `None`.
+- guard: `inspect.signature(litestar.Litestar.__init__).parameters["request_max_body_size"].default`
+  equals `_LITESTAR_DEFAULT_REQUEST_MAX_BODY_SIZE`.
+
+Once green, drop the `request_max_body_size=1000` workaround from the
+access-logging tests added in `2026-08-10.01`, so the suite stops carrying a
+note about a defect that no longer exists.
+
+Then `just lint-ci` and the full `just test`.
+
+## Risk
+
+**The constant drifts from Litestar's default.** Low likelihood, low impact
+(the number is a size limit), and the guard test converts it into a failed CI
+run on the bump that changes it.
+
+**A caller relying on the 500.** Implausible — it is an
+`ImproperlyConfiguredException`, not a documented limit.
+
+**Promotion:** `architecture/bootstrappers.md` records that `_apply_config` now
+also fills Litestar's unset body-size default, alongside `debug` and the
+teardown hook.