Batch 235-A / 236-A ACCEPTED -- Theorem 8.6.1's hole SHARPENED to the (8.4.25) cross contraction (the display is now PROVED); Theorem 8.10.2 refined the same way (registered holes unchanged, five)

Theorem 8.6.1 (Definitions/MMFLM810Theorem861Stated.lean) no longer carries a monolithic `sorry` at
the display.  The refinement uses the landed both-way identification
MM.FLM86DP.displayAllStates_iff_commutatorInsertion8625 (MMFLM86DisplayPair.lean:132)

    DisplayAllStates (ZAligned E)  <->  CommutatorInsertion8625 E (honestIns8625 E),

with honestIns8625 definitionally the (8.5.24) iterate family (honestIns8625_apply): the display IS
the commutator half at the honest insertion and nothing else.  The file now reads

* the hole `crossContraction_evenCocycle` = ModeFieldCommInsertionStep8625 E (honestIns8625 E), the
  formal application of (8.4.25) (printed pp. 192--193) producing the (8.6.25) pairing factor on the
  commutator side (8.6.23)/(8.6.24) (p. 210) -- the ONE registered `sorry` of the file;
* `commutatorHalf_evenCocycle` -- PROVED from the PROVED (8.6.9)/(8.6.10) input
  (`modeFieldCommInput_evenCocycle`, batch 219-B) plus the hole, via `commutatorHalf_of_step`;
* `displayAllStates_evenCocycle` -- PROVED from the commutator half by `.mpr` of the identification;
* the absorbed spine of the file's section 2 (batch 234): (8.6.11) PROVED at source,
  (8.6.13)--(8.6.19) carriers landed with the batch-105 separation, (8.6.20)--(8.6.22) LANDED,
  (8.6.25)/(8.6.27) left side = the landed iterate, plus the #check'ed interface of the halves and the
  landed bridge modeStepExists_of_insertion.

Consequence: hole #1 is strictly smaller than recorded -- the matching (residuals #3/#4) is NOT part
of Theorem 8.6.1's display; the remaining book step is "(8.4.25) applied to the normally-ordered
(8.6.9) object" alone.

Theorem 8.10.2 (Definitions/MMFLM810Theorem8102Stated.lean) is refined the same way:

* the commutator half `commutatorInsertion_evenCocycle` is taken DIRECTLY from the batch-235 PROVED
  `MM.FLM810T861S.commutatorHalf_evenCocycle` (carrying the sharpened hole), so the DISPLAY is off
  8.10.2's dependency path; the hole table records #1 in its sharpened currency (no new hole, the three
  holes and all footprints are unchanged);
* section 1.1 added: the three holes at their sharpest landed currencies, with a #check'ed interface --
  #2 `NegativeResidual` (the landed `negativeFaces_of_residual` shows the batch-202 generator chamber is
  not double-counted; the `l >= 0` faces are landed), #3 `FockStep` (ONE one-mode step, equivalent to
  `fockStep_imp_oneMode`, lattice base `faceAtFamily_lattice` PROVED, the (8.6.6)-side reindexing proved
  in batch 233), #4 `ResidueMatching8625NegSecondSlot` (strictly additional to `l = 0`,
  `honestBlockCoeffJL_one_rankOne`) -- plus the landed equivalences and bridges
  (`honestNegPairingCoeffAtStates_iff_fockStep`, `honestNegPairingCoeff_iff_atStates`,
  `residueMatching8625_iff_coeff_and_slot`, `stepCorrected_of_commutatorHalf`,
  `groundedModeStep_of_commutatorInsertion`, `allStates_of_matching_and_groundedStep`).

Registered holes after this commit (count unchanged, five): #1 the (8.4.25) cross contraction
(`MM.FLM810T861S.crossContraction_evenCocycle`); #2/#3/#4 the three holes of
MMFLM810Theorem8102Stated.lean; plus the 8.8.9 file's hole -- its statement still covers the `l = 0`
face, which `commutatorHalf_evenCocycle` now supplies, so a further sharpening is available there (not
yet made; noted for the next batch).

FinalCheck.lean GREEN; all guards match (the two new 8.6.1 declarations are guarded WITH `sorryAx`, on
purpose); Probe/forbidden_tokens.py reads sorry=1 (8.6.1 file, the sharpened hole) and sorry=3 (8.10.2
file, #2/#3/#4), all other counts zero.  HANDOVER.md (section 1 row 1, section 6 item 4, the 8.10.2
row), README.md (the sorry map row), ROADMAP.md (frontier #1) and NOTES.md (sections 133, 134) updated.
