feat(tui): add @-triggered fuzzy file picker in input

CHANGELOG.md

@@ -7,6 +7,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 ## [Unreleased]
 
 ### Added
+- `@`-triggered fuzzy file picker in TUI input — type `@` to search project files by name/path/extension with real-time filtering (#600)
 - Orchestrator provider option in `zeph init` wizard for multi-model routing setup (#597)
 - `zeph vault` CLI subcommands: `init` (generate age keypair), `set` (store secret), `get` (retrieve secret), `list` (show keys), `rm` (remove secret) (#598)
 - Atomic file writes for vault operations with temp+rename strategy (#598)

Cargo.toml

@@ -32,6 +32,7 @@ eventsource-stream = "0.2"
 http-body-util = "0.1"
 futures-core = "0.3"
 notify = "8"
+nucleo-matcher = "0.3.1"
 notify-debouncer-mini = "0.7"
 ollama-rs = { version = "0.3", default-features = false, features = ["rustls", "stream"] }
 pdf-extract = "0.7"

README.md

@@ -275,6 +275,7 @@ A full terminal UI powered by ratatui — not a separate monitoring tool, but an
 
 - Tree-sitter syntax highlighting and markdown rendering
 - Syntax-highlighted diff view for file edits (compact/expanded toggle)
+- `@`-triggered fuzzy file picker with real-time filtering (nucleo-matcher)
 - Live metrics: token usage, filter savings, cost tracking, confidence distribution
 - Conversation history with message queueing
 - Responsive input handling during streaming with render cache and event batching

crates/zeph-tui/Cargo.toml

@@ -8,6 +8,8 @@ repository.workspace = true
 
 [dependencies]
 anyhow.workspace = true
+ignore.workspace = true
+nucleo-matcher.workspace = true
 crossterm.workspace = true
 pulldown-cmark.workspace = true
 ratatui.workspace = true
@@ -32,6 +34,7 @@ zeph-core.workspace = true
 expectrl = "0.8"
 insta = "1.42"
 proptest = "1.6"
+tempfile.workspace = true
 tokio = { workspace = true, features = ["macros", "rt-multi-thread"] }
 
 [lints]

crates/zeph-tui/README.md

@@ -11,6 +11,7 @@ Provides a terminal UI for monitoring the Zeph agent in real time. Built on rata
 - **app** — `App` state machine driving the render/event loop
 - **channel** — `TuiChannel` implementing the `Channel` trait for agent I/O
 - **event** — `AgentEvent`, `AppEvent`, `EventReader` for async event dispatch
+- **file_picker** — `@`-triggered fuzzy file search with `nucleo-matcher` and `ignore` crate
 - **highlight** — syntax highlighting for code blocks
 - **layout** — panel arrangement and responsive grid
 - **metrics** — `MetricsCollector`, `MetricsSnapshot` for live telemetry