fix(commands): use background Bash to avoid shell timeout killing servers

[akdoan1]

Summary

• Replace ! shell preprocessing with run_in_background: true Bash instructions in review, annotate, and annotate-last slash commands
• Fixes servers being killed after ~2 minutes due to Claude Code's shell preprocessing timeout
• Prevents annotation loss when the server dies mid-review

Problem

The /plannotator-review, /plannotator-annotate, and /plannotator-last slash commands use the ! preprocessing syntax, which runs plannotator as a blocking shell command. The server blocks on waitForDecision() until the user submits, but Claude Code's shell preprocessing has a ~120s timeout that kills the process during long sessions.

Plan mode doesn't have this issue because it uses a PermissionRequest hook with a 96-hour timeout (hooks.json).

When the process is killed:

1. The draft file survives on disk, but only contains annotations up to the last successful auto-save
2. Auto-save failures are silent (.catch(() => {})), so the user has no indication their work isn't being saved
3. Reopening recovers partial annotations but anything after the last save is lost

Fix

Replace !plannotator review $ARGUMENTS`` with skill instructions that tell Claude to run the command via the Bash tool with run_in_background: true. Background Bash tasks have no timeout and notify Claude when complete.

No server code changes, no build required — only the 3 .md skill files are modified.

Test results

Tested with run_in_background: true Bash tasks (the approach this PR uses). Both servers survived 135 seconds (past the old 120s kill threshold) and successfully captured annotations on submission:

Test	Survived 135s	Annotations submitted	Feedback captured
plannotator review	Yes	Yes	Yes — review feedback on diff
plannotator annotate	Yes	Yes	Yes — annotation on markdown

Review output (after 135s wait):

# Code Review Feedback

## test.txt

### Line 1 (new) — ``hello world`` (chars 0-11)
test

The reviewer has identified issues above. You must address all of them.

Annotate output (after 135s wait):

# File Feedback

I've reviewed this file and have 1 piece of feedback:

## 1. Feedback on: "Test file"
> test

Environment

• Claude Code v2.1.108
• Plannotator v0.19.0
• macOS 26.4

[backnotprop]

Hey, I'm happy to review this. I'll give it a shot. I haven't actually run into this problem before.

Usually it gets auto background.

Fixes servers being killed after ~2 minutes due to Claude Code's shell preprocessing timeout

And now the slash command would force the agent to call it, where before it was deterministic and happened automatically.