Remove poc-memory daemon and RPC infrastructure

The background daemon and its job orchestration are redundant now that
the consciousness binary handles everything directly. Gut daemon.rs
down to just GraphHealth + compute_graph_health (used by the F4 TUI
screen), remove the DaemonCmd CLI subcommand, strip daemon RPC
fast-paths from cli/agent.rs, and drop the jobkit dependency.

-1330 lines.

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

Cargo.lock

@@ -538,7 +538,6 @@ dependencies = [
  "http-body-util",
  "hyper",
  "hyper-util",
- "jobkit",
  "json5",
  "libc",
  "log",
@@ -1569,20 +1568,6 @@ dependencies = [
  "syn 2.0.117",
 ]
 
-[[package]]
-name = "jobkit"
-version = "0.3.0"
-source = "git+https://evilpiepirate.org/git/jobkit.git#4aacaac22c5f59a7fbc6ce3a65708fc370e55754"
-dependencies = [
- "chrono",
- "libc",
- "log",
- "profiling",
- "serde",
- "serde_json",
- "tokio",
-]
-
 [[package]]
 name = "jobserver"
 version = "0.1.34"
@@ -2209,25 +2194,6 @@ dependencies = [
  "yansi",
 ]
 
-[[package]]
-name = "profiling"
-version = "1.0.17"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3eb8486b569e12e2c32ad3e204dbaba5e4b5b216e9367044f25f1dba42341773"
-dependencies = [
- "profiling-procmacros",
-]
-
-[[package]]
-name = "profiling-procmacros"
-version = "1.0.17"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "52717f9a02b6965224f95ca2a81e2e0c5c43baacd28ca057577988930b6c3d5b"
-dependencies = [
- "quote",
- "syn 2.0.117",
-]
-
 [[package]]
 name = "ptr_meta"
 version = "0.1.4"