v0.2.1

• System prompt reframed as "SUMMARISATION TOOL" with
  explicit anti-roleplay instructions. Conditional: uses
  generic format instructions when SEAMLESS_PROMPT_FILE
  is active to avoid heading conflicts with custom prompts.

• Transcript wrapping in <transcript> XML tags creates
  a clear data boundary between instructions and input.

• Closing instruction appended after the transcript:
  "Produce the structured summary now."

• User prompt restructured: numbered section prefixes
  removed (### 1. → ## ), explicit "include ALL six
  sections" rule, 2000 char minimum target.

• Plugin manifest version synced with package.json.