Logging overhaul: per-task log files, daemon.log drill-down

Switch from jobkit-daemon crate to jobkit with daemon feature.
Wire up per-task log files for all daemon-spawned agent tasks.

Changes:
- Use jobkit::daemon:: instead of jobkit_daemon::
- All agent tasks get .log_dir() set to $data_dir/logs/
- Task log path shown in daemon status and TUI
- New CLI: poc-memory agent daemon log --task NAME
  Finds the task's log path from status or daemon.log, tails the file
- LLM backend selection logged to daemon.log via log_event
- Targeted agent job names include the target key for debuggability
- Logging architecture documented in doc/logging.md

Two-level logging, no duplication:
- daemon.log: lifecycle events with task log path for drill-down
- per-task logs: full agent output via ctx.log_line()

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

Cargo.lock

@@ -1805,25 +1805,13 @@ checksum = "92ecc6618181def0457392ccd0ee51198e065e016d1d527a7ac1b6dc7c1f09d2"
 
 [[package]]
 name = "jobkit"
-version = "0.1.0"
-source = "git+https://evilpiepirate.org/git/jobkit.git/#2cdf0d5c3dd55f3d1783c40211a7eb96707d1ab6"
-dependencies = [
- "crossbeam-deque",
- "log",
- "profiling",
- "serde",
- "serde_json",
-]
-
-[[package]]
-name = "jobkit-daemon"
-version = "0.4.0"
-source = "git+https://evilpiepirate.org/git/jobkit-daemon.git/#6faa0a06e3b2d69ea22fc691b4e8e4760b0772f7"
+version = "0.2.0"
 dependencies = [
  "chrono",
- "jobkit",
+ "crossbeam-deque",
  "libc",
  "log",
+ "profiling",
  "serde",
  "serde_json",
 ]
@@ -2655,7 +2643,6 @@ dependencies = [
  "crossterm 0.28.1",
  "faer",
  "jobkit",
- "jobkit-daemon",
  "libc",
  "log",
  "memmap2",