fix(stringify): render ordered-list start as native numbering

[hendrikheil]

Problem

An ordered list with a non-1 start round-tripped to the verbose ::ol{…} block form instead of native markdown numbering:

5. First item        ::ol{start="5"}
6. Second item   →    1. First item
7. Third item         2. Second item
                      ::

The same path means a legacy ::ol{start="…"} wrapper (e.g. one written by an older renderer) never normalizes back to a plain list — it stays an MDC component block. AST and HTML were already correct; only the Markdown round-trip was affected.

Root cause

handlers/ol.ts hardcoded the item counter to order: 1, and nothing marked start as implicit. So userBlockAttrs('ol', { start }) treated start as a genuine user attr and forced the ::ol{…} wrapper form, losing the native numbering.

Fix

• handlers/ol.ts: seed the item counter from start (order = start >= 1 ? start : 1) so native numbering carries it.
• stringify/attributes.ts: add ol: { drop: ['start'] } to IMPLICIT_ATTRS, so start is recognized as conveyed by the native syntax and never echoes into a wrapper.

Result (idempotent)

• 5. 6. 7. → round-trips as native 5. 6. 7.
• ::ol{start="3"}\n1. …\n:: → normalizes to native 3. 4. …
• ::ol{start="undefined"}\n1. …\n:: → heals to clean 1. 2. 3.
• ::ol{attr="value"} (a genuine non-start attr) → still wraps (unchanged)

Tests

Two new SPECs (common-mark/ordered-list-start.md, COMARK/ordered-list-start-wrapper-normalizes.md); full suite 1084 passing. The #214 attribute specs (attributes/ordered-list.md, attributes/wrapped-ol.md) stay green.

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commit: d0b3b62

[farnabaz]

Thanks