principle: homophilly -> clustering -> reification -> vocabulary extension

formalize the the dynamics leading up to the phase transition of learning a new concept. the idea here is to motivate developing mechanisms that contain affordances for organically facilitating this pipeline's action. examples (of desired outcomes) include:

* the 'invariant' lineage linting rule that suggests the vocabulary merits extension (or some chain members are missing a tag)
* partitioning views by tag (to constrain the readers' attention to clusters)
* ...

Start by translating the homophily → clustering → reification → vocabulary-extension pipeline into explicit requirements, then inspect the existing invariant linting, tag-based views, and decision-record reference tracking described in the issue. Done should include a decided mechanism for motivating vocabulary extension and a clear definition of the desired linting and clustering outcomes.

Written by the indexing model from the issue text.