dikw-core v0.6.4

0.6.4 — K-layer system prompts extracted to packaged .md; product self-reference unified to dikw

Changed

• K-layer system prompts extracted to prompts/*.md; product self-reference
  unified to dikw. The three inline system-prompt constants under
  domains/knowledge (DEFAULT_SYNTH_SYSTEM, _MERGE_SYSTEM, _GROUNDED_SYSTEM)
  now load from packaged prompts/synthesize_system.md,
  prompts/lint_fix_orphan_merge_system.md, and
  prompts/lint_fix_broken_wikilink_grounded_system.md via prompts.load(...) —
  like every other prompt (CLAUDE.md "Don't inline prompts in code"). Constant
  names, call sites, and the public surface are unchanged. Every packaged prompt
  (synth + lint + eval) now refers to the product as dikw rather than
  dikw-core, and the two lint system prompts gained the same self-intro the
  other authoring prompts already carry. No on-disk format, schema, CLI, or API
  change.