chore(spec): regenerate spec-changes.json and the upgrade guide on the merged tree

Step 4 of the os-regen merge of origin/main 76bc1e0, through the
packages' own generators (`gen:spec-changes`, `gen:upgrade-guide`;
`gen:migration-registry` rewrote registry.ts byte-identically).

The committed spec-changes.json main brought still listed the three
step-18 entries this branch absorbs (element-number-filter-rule-array,
element-record-picker-filter-rule-array,
object-grid-default-filters-rule-array) and lacked this branch's two D3
entries. `check:spec-changes` no longer compares the committed copy (it
generates in memory), so it read green, while
`check-adr-0087-registration` reads the committed copy at HEAD as its
parser witness and refused with "ledger parser drift". Regenerating the
committed copies from the merged registry clears it. The copies also
pick up registry text main changed without regenerating them (the
objectui pin readings at 20c6d351a, the storage-scope and flow-slot
guidance).

Claude-Session: https://claude.ai/code/session_01DhTqaEHqPVSVnAkjG3jywn
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude