Records the parser design facts a future agent needs before touching Jai.bnf:
the token-factory requirement, what lives in JaiParserUtil and why, the PSI
element that truncates an enclosing expression, longest-first operator ordering,
and directive-flag adjacency. Adds the stale-output symptoms and the sticky
--tests filter to the environment gotchas, and writes down the grammar
iteration loop.
Phase 3 is marked done; the remaining 58 corpus files are listed as the pick-up
point with the three known gaps named.
