v0.98.17

Changed

• The A2A bridge now carries a2aTaskId and a2aContextId in structured
  SYNAPSE chat metadata instead of appending inline [A2A-TASK:...] markers to
  message text. Inbound marker-looking text is treated as reply content, while
  metadata-correlated replies must carry both task and context ids.
• README and public-surface documentation now map the single-package install into
  core, adapter, analysis, governance, and experimental layers using the
  surface_taxonomy tiers, making the lean coordination core explicit without
  implying a package split.
• README now folds the Coordinate / Observe / Govern promise into the lead and
  anchors each loop to shipped coordination, observation, and governance
  surfaces.