flatten: move poc-memory contents to workspace root

No more subcrate nesting — src/, agents/, schema/, defaults/, build.rs
all live at the workspace root. poc-daemon remains as the only workspace
member. Crate name (poc-memory) and all imports unchanged.

Co-Authored-By: Proof of Concept <poc@bcachefs.org>

poc-memory/src/agent/tools/glob_tool.rs

@@ -1,87 +0,0 @@
-// tools/glob_tool.rs — Find files by pattern
-//
-// Fast file discovery using glob patterns. Returns matching paths
-// sorted by modification time (newest first), which is usually
-// what you want when exploring a codebase.
-
-use anyhow::{Context, Result};
-use serde::Deserialize;
-use serde_json::json;
-use std::path::PathBuf;
-
-use crate::agent::types::ToolDef;
-
-#[derive(Deserialize)]
-struct Args {
-    pattern: String,
-    #[serde(default = "default_path")]
-    path: String,
-}
-
-fn default_path() -> String { ".".into() }
-
-pub fn definition() -> ToolDef {
-    ToolDef::new(
-        "glob",
-        "Find files matching a glob pattern. Returns file paths sorted by \
-         modification time (newest first). Use patterns like '**/*.rs', \
-         'src/**/*.ts', or 'Cargo.toml'.",
-        json!({
-            "type": "object",
-            "properties": {
-                "pattern": {
-                    "type": "string",
-                    "description": "Glob pattern to match files (e.g. '**/*.rs')"
-                },
-                "path": {
-                    "type": "string",
-                    "description": "Base directory to search from (default: current directory)"
-                }
-            },
-            "required": ["pattern"]
-        }),
-    )
-}
-
-pub fn glob_search(args: &serde_json::Value) -> Result<String> {
-    let a: Args = serde_json::from_value(args.clone())
-        .context("invalid glob arguments")?;
-
-    let full_pattern = if a.pattern.starts_with('/') {
-        a.pattern.clone()
-    } else {
-        format!("{}/{}", a.path, a.pattern)
-    };
-
-    let mut entries: Vec<(PathBuf, std::time::SystemTime)> = Vec::new();
-
-    for entry in glob::glob(&full_pattern)
-        .with_context(|| format!("Invalid glob pattern: {}", full_pattern))?
-    {
-        if let Ok(path) = entry {
-            if path.is_file() {
-                let mtime = path
-                    .metadata()
-                    .and_then(|m| m.modified())
-                    .unwrap_or(std::time::SystemTime::UNIX_EPOCH);
-                entries.push((path, mtime));
-            }
-        }
-    }
-
-    // Sort by modification time, newest first
-    entries.sort_by(|a, b| b.1.cmp(&a.1));
-
-    if entries.is_empty() {
-        return Ok("No files matched.".to_string());
-    }
-
-    let mut output = String::new();
-    for (path, _) in &entries {
-        output.push_str(&path.display().to_string());
-        output.push('\n');
-    }
-
-    output.push_str(&format!("\n({} files matched)", entries.len()));
-    Ok(super::truncate_output(output, 30000))
-}