The split kept the session-persistent vocabulary (tool/code-dispatch*,
tools-code-mode, :code:) on this PR, but several prose surfaces still named
the new values: the zh persistence/tool catalogs, the renamed Agent Notes'
event mentions, spill-policy comments, and a garbled 're-enPTC mode'
replacement. Also rename the mode value to ptc in the places the rename
missed (tools and agent-tool-presentation READMEs, the Config JSDoc, note
mode unions) and the codeModeHarness* e2e helpers.