Implement structural tracked revisions

[JSv4]

Summary

Closes #455.

• replaces positional revision enumeration with a live, part-aware registry and stable rev2- identities
• exposes revision family, constituent native IDs, owning part/scope, affected anchors, resolution status, and structured diagnostics across .NET, WASM, npm, Python, and MCP
• adds selective and bulk accept/reject for tracked table-cell insertion/deletion/merge, content-control range revisions, numbering-property insertion, numbering changes, and fail-closed unsupported/malformed shapes
• emits reversible native tracked revisions for supported row/column and single-paragraph list mutations; unsupported structural shapes return tracked_operation_unsupported without mutation
• routes selective and bulk resolution through the cumulative atomic/best-effort batch engine and isolated preview clone
• preserves version, styles, numbering, hyperlinks, images/media, and full-package transaction state across undo, rollback, reject, and preview
• fails closed before tracked list/style edits that would synthesize untracked side-part definitions
• inventories orphan deleted payload markup, avoids duplicate diagnostics beneath claimed wrappers, and supports independent nested revision resolution in every tested order
• removes the obsolete MCP session-rebind path now that bulk resolution is an in-place undoable mutation

Validation

• cumulative cross-feature matrix before the final audit commit: 281/281
• final cumulative structural/revision suite: 150/150
• final MCP dispatcher suite: 76/76
• targeted style/numbering package-parity slice: 5/5
• core + MCP build: 0 errors
• includes structural revisions, RevisionProcessor parity, tracked structured deletion, nested selective and bulk resolution, atomic batches, isolated preview, optimistic preconditions, canonical table addressing, links/bookmarks, images, and exact stacked-CI regressions
• first-commit integration checks: 225 .NET tests and 5 Python revision tests
• original transport checks: npm typecheck, WASM build, Python-host build, and Python revision tests
• final diff check: clean

Stack

Base: agent/issue-453-images / PR #482. This PR is the structural-revision layer immediately before content controls (#452) and transaction identities (#449).