Batch 238-A ACCEPTED -- Theorem 8.10.2 now comes from (8.10.8) = Theorem 8.8.9 alone (the book's own route); the matching (#3/#4) is off its dependency path

Definitions/MMFLM810Theorem8102Stated.lean: theorem8102_evenCocycle is re-routed to the book's own
reduction -- section 8.10's verification consumes (8.10.8), the Jacobi identity at the span, which IS
Theorem 8.8.9:

  MM.FLM810CFC.theorem8102_of_hs   (MMFLM810CurrentFieldComm.lean:431, (8.10.13) discharged)
    hnd hs (C.toCentralExtension h2) S hpd hW hfin
    ((MM.FLM810ASM.jacobiEvenCocycle_iff_faces ...).mpr
      (MM.FLM88T889S.theorem889_faithful ...))        -- the 8.8.9 hole, FacesAtStates

`theorem8102_of_hs` carries `hjac : MM.FLM810RR.JacobiOnStateTargets (vertexOpOfField (Yaligned E))`,
which IS `JacobiEvenCocycle C h2` and, by the landed `jacobiEvenCocycle_iff_faces` (Iff.rfl), IS
`FacesAtStates E`.  So the theorem's `sorryAx` flows through `theorem889_faithful` ALONE.

Kept, but recorded OFF the final theorem's dependency path (they are the standalone matching package):
fockStep_evenCocycle (#3), secondSlot_evenCocycle (#4) and their consumers
(honestNegPairingCoeff_evenCocycle, residueMatching8625_evenCocycle,
corollary851AllStatesExists_evenCocycle, evenCocycleResidualsCorrectedNormal_evenCocycle), plus
commutatorInsertion_evenCocycle / jacobiStep_evenCocycle (8.10.2 no longer needs them: 8.6.1 is the
Res_{z_0} face of 8.8.9, Remark 8.8.11).  The matching is strictly STRONGER than 8.8.9's statement --
an explicit identity of the iterate with the block sum, not a relation between the two sides -- so it
cannot be derived from the 8.8.9 hole; what is true is that its content is part of 8.8.9's PROOF (the
book proves 8.8.9 by repeating 8.6.1's proof, which computes the iterate side via (8.6.25)/(8.6.27)).

Registered holes: still FOUR -- (1) the (8.4.25) cross contraction (MM.FLM810T861S);
(2) MM.FLM88T889S.theorem889_faithful (8.8.9 source-faithful) -- the ONE Theorem 8.10.2 goes through;
(3) FockStep; (4) ResidueMatching8625NegSecondSlot, the last two being the standalone matching package.
To collapse to ONE hole the matching package would have to leave the ledger (its Props remain in
MMFLM86M8625 / MMFLM86NPFS) -- not done here, since it is a recorded deliverable.

Both files build `--- OK ---`; FinalCheck.lean GREEN; guards unchanged (the theorem's guard still
prints sorryAx, now through the 8.8.9 hole).  Probe/forbidden_tokens.py: sorry=2 for the 8.10.2 file
(the matching package), sorry=1 for the 8.8.9 file.  README.md, HANDOVER.md, ROADMAP.md and NOTES.md
(section 138) record the re-route and the book chain.
