✨ Add bind-style context helpers

docs/README-en.md

@@ -21,6 +21,7 @@ BitLogger currently provides:
 - reusable filter helpers such as `target_has_prefix(...)`, `message_contains(...)`, `level_at_least(...)`, and `field_equals(...)`
 - record patching via `with_patch(...)` and `patch_sink(...)`
 - patch helpers such as `prefix_message(...)`, `append_fields(...)`, and `redact_fields(...)`
+- context binding via `bind(...)` and `fields(...)`
 - explicit queued delivery via `queued_sink(...)` and `with_queue(...)`
 - bounded backlog with `QueueOverflowPolicy::DropNewest` and `QueueOverflowPolicy::DropOldest`
 - configurable text formatting via `text_formatter(...)`, `format_text(...)`, `text_console_sink(...)`, and template-driven `template` output
@@ -110,6 +111,15 @@ let logger = Logger::new(console_sink(), target="auth")
 logger.info("login", fields=[field("user", "alice"), field("token", "secret")])
 ```
 
+Context binding:
+
+```moonbit
+let logger = Logger::new(console_sink(), target="audit")
+  .bind(fields([("service", "bitlogger"), ("scope", "login")]))
+
+logger.info("accepted", fields=[field("user", "alice")])
+```
+
 Explicit queued sink:
 
 ```moonbit

docs/changes/0.3.0.md

@@ -30,6 +30,7 @@ version 0.3.0
 - feat: add `FileRotation`, `file_rotation(...)`, and size-based file rotation with retained backups for `file_sink(...)`
 - feat: support `sink.rotation.max_bytes` and `sink.rotation.max_backups` in JSON logger config
 - feat: add `SplitSink`, `split_sink(...)`, and `split_by_level(...)` for routing records into different sinks by predicate or level
+- feat: add `Logger::bind(...)` as an ergonomic context-binding alias and `fields(...)` helper for tuple-based field construction
 
 ### Test
 
@@ -42,6 +43,7 @@ version 0.3.0
 - test: cover template-based formatter rendering and disabled token behavior
 - test: cover file rotation config parsing, config roundtrip, and native rotation behavior
 - test: cover split sink predicate routing and level-based routing behavior
+- test: cover `bind(...)` context composition and `fields(...)` helper behavior
 - test: add async logger lifecycle, config roundtrip, and batching/flush policy test seeds
 - build: verify `bitlogger_async --target native` and `examples/async_basic --target native` compile successfully
 
@@ -55,6 +57,7 @@ version 0.3.0
 - docs: update formatter examples to demonstrate template-based text rendering
 - docs: update file sink examples to demonstrate rotation and backup retention
 - docs: add split sink examples for level-based routing
+- docs: add `bind(...)` examples for reusable context binding
 - docs: update root README and English README with async adapter notes and current scope
 - chore: ignore local `.mooncakes/` cache directory in git