quill: add summarize spell draft

wizard-work/quill/spell-draft-summarize.md

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+# Spell Draft: Summarize
+
+## Invocation
+```
+summarize --input <text> --format <brief|detailed|bullets>
+```
+
+## Parameters
+- `input`: text to condense
+- `format`: output style (brief, detailed, bullets)
+
+## Casting Notes
+Extract the single main claim, then list supporting evidence in
+chronological or priority order. No adjectives; plain claims only.
+
+## Verdict Template
+VERDICT: <one-line claim>
+CHECK: <single bare shell command whose exit code IS the verdict>