subconscious: flatten agents/ nesting, move prompts in

agents/*.agent definitions and prompts/ now live under
src/subconscious/ alongside the code that uses them.
No more intermediate agents/ subdirectory.

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

Cargo.lock

@@ -467,7 +467,6 @@ dependencies = [
  "iana-time-zone",
  "js-sys",
  "num-traits",
- "serde",
  "wasm-bindgen",
  "windows-link",
 ]
@@ -2759,33 +2758,6 @@ dependencies = [
  "time",
 ]
 
-[[package]]
-name = "poc-agent"
-version = "0.4.0"
-dependencies = [
- "anyhow",
- "base64 0.22.1",
- "chrono",
- "clap",
- "crossterm",
- "dirs",
- "figment",
- "futures",
- "glob",
- "json5",
- "libc",
- "ratatui",
- "reqwest",
- "serde",
- "serde_json",
- "tiktoken-rs",
- "tokio",
- "tui-markdown",
- "tui-textarea-2",
- "unicode-width",
- "walkdir",
-]
-
 [[package]]
 name = "poc-daemon"
 version = "0.4.0"