[Feature]: Do not append `dcp-system-reminder` with manual mode

[Shad3N]

Problem

My config has:

{
  "$schema": "https://raw.githubusercontent.com/Opencode-DCP/opencode-dynamic-context-pruning/master/dcp.schema.json",
  "manualMode": {
    "automaticStrategies": false,
    "enabled": true
  }
}

Despite the manual mode being explicitly set, the reminders about compression and other metadata is regularly injected to my chat, adding unnecessary tokens.

Proposed Solution

I believe with manual mode, it would be enough to only inject the message IDs and then inject all compression related info when the compression command is called.