feat: add formatrix-bridges crate and missing AST module

- Create ast.rs with Document, Block, Inline, SourceFormat types
- Scaffold formatrix-bridges crate with KnowledgeStore trait
- Implement TriliumBridge (ETAPI REST client)
- Implement FsBridge (filesystem: Obsidian, Logseq, Zettlr)
- Add crate to workspace
- Add .gitignore entries for Zig build artifacts

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: hyperpolymath

.gitignore

@@ -17,3 +17,5 @@ __pycache__/
 
 # Crash recovery artifacts
 ai-cli-crash-capture/
+zig-out/
+.zig-cache/

Cargo.toml

@@ -10,6 +10,7 @@ members = [
     "crates/formatrix-gui",
     "crates/formatrix-db",
     "crates/formatrix-pipeline",
+    "crates/formatrix-bridges",
 ]
 
 [workspace.package]
@@ -64,6 +65,21 @@ tracing-subscriber = { version = "0.3", features = ["env-filter"] }
 # Utilities
 unicode-segmentation = "1.11"
 
+# HTTP client (for bridges)
+reqwest = { version = "0.12", default-features = false, features = ["json", "rustls-tls"] }
+
+# Async trait (for KnowledgeStore)
+async-trait = "0.1"
+
+# URL encoding
+urlencoding = "2.1"
+
+# File watching
+notify = "7.0"
+
+# Base64
+base64 = "0.22"
+
 [profile.release]
 lto = true
 codegen-units = 1

crates/formatrix-bridges/Cargo.toml

@@ -0,0 +1,53 @@
+# SPDX-License-Identifier: PMPL-1.0-or-later
+[package]
+name = "formatrix-bridges"
+description = "Knowledge tool bridges for Formatrix — Trilium, Obsidian, Joplin, Logseq interop"
+version.workspace = true
+edition.workspace = true
+authors.workspace = true
+license.workspace = true
+repository.workspace = true
+
+[dependencies]
+# Formatrix core for AST, parsers, renderers
+formatrix-core = { path = "../formatrix-core" }
+
+# HTTP client for REST API bridges (Trilium ETAPI, Joplin Data API)
+reqwest.workspace = true
+
+# Serialization
+serde.workspace = true
+serde_json.workspace = true
+
+# Error handling
+thiserror.workspace = true
+anyhow.workspace = true
+
+# Async runtime
+tokio.workspace = true
+
+# Logging
+tracing.workspace = true
+
+# Async trait
+async-trait.workspace = true
+
+# URL encoding
+urlencoding.workspace = true
+
+# File watching for filesystem-based bridges (Obsidian, Logseq)
+notify.workspace = true
+
+# Base64 for Trilium ETAPI auth
+base64.workspace = true
+
+[dev-dependencies]
+tokio-test = "0.4"
+mockito = "1.6"
+tempfile = "3.14"
+
+[features]
+default = ["trilium", "filesystem"]
+trilium = []
+joplin = []
+filesystem = []  # Obsidian, Logseq, Zettlr (folder-of-files)

crates/formatrix-bridges/src/bridges/mod.rs

@@ -0,0 +1,8 @@
+// SPDX-License-Identifier: PMPL-1.0-or-later
+//! Knowledge tool bridge implementations
+
+#[cfg(feature = "trilium")]
+pub mod trilium;
+
+#[cfg(feature = "trilium")]
+pub use trilium::TriliumBridge;