fix(docx-compare): repair inherited edited endnote reader misbinding beside stable notes

[stevenobiajulu]

Edited endnotes beside unchanged endnotes can still misbind in LibreOffice

Inherited, independently reproduced on main 9d82bab96ec3bd23c772a1bc2792cfbabc146652 and PR #994's updated reviewed head 40fc49a050aed0765bcdb8ad940534b68e7b5438. Not a regression of terminal cleanup or the aligned-footnote repair. The current reconciliation path is footnote-only; moved unchanged endnotes are covered, but edited endnotes alongside stable endnotes are not repaired.

Dynamic synthetic control: five aligned endnote anchors, first body edited. Current and independently extracted main source both produce anchor IDs [1,6,2,3,4,5]. Actual LibreOffice Accept/Reject dispatches on the unresolved comparison do not match independently imported revised/original identity controls: Accept binds anchor1 to stable body2 and anchor5 to the edited revised body; Reject also misbinds. Both projection parity checks are false on both versions. No private document or document upload.

Cause candidate: packages/docx-compare/src/tagged/pipeline.ts reconcileTaggedFootnotes is footnote-only; there is no corresponding endnote stabilization, so stabilizedNoteKinds never records an edited endnote and the coarse del(1)/ins(6) shape remains. This is a candidate bounded repair, not a measured Word policy.

• Add native/AST/full-package and actual-reader red controls with independently loaded original/revised identity states.
• Characterize a bounded endnote analogue, retaining fine-grained definition history, unchanged/orphan/reserved definitions and fail-closed ambiguity checks.
• Cover lexical decimal IDs, multiple edits/moves, format-changing anchors and unrelated note kinds without blanket renumbering.
• Validate complete inputs/outputs and distinguish schema/text fidelity from reader binding; no punctuation normalization or field locking.
• Review and ship separately with full local/CI/corpus/exact-merge public smoke gates.

Word Accept/Reject remains UNVERIFIED. Schema validity of these additional scratch probes was not adjudicated by this finding; do not call them schema-certified controls.

Public/synthetic-only local reproduction: /private/tmp/safe-docx-979-note-reader-20260917/.peer-review/probe/edge.probe.test.ts, 979-edge-head.log, 979-edge-main.log, and complete actual Opus5 review 979-integration-993-opus5-20260917.review.txt §5c/6a. Reviewer model/trace and exit0 collected by the supervisor. Ref: #979, #990, #992, PR #994.