Remove empty Comments columns from README.md tables

[Copilot]

Three tables in README.md had Comments columns where every row was empty. Removed these columns to reduce visual clutter.

Tables modified:

• Location Lexicon Properties table (7 rows)
• activityWeight Defs table (2 rows)
• Hypercerts Contribution Properties table (6 rows)

Before:

| Property    | Type     | Required | Description              | Comments |
| ----------- | -------- | -------- | ------------------------ | -------- |
| `role`      | `string` | ❌       | Role of contributor(s)   |          |
| `createdAt` | `string` | ✅       | Record creation timestamp|          |

After:

| Property    | Type     | Required | Description              |
| ----------- | -------- | -------- | ------------------------ |
| `role`      | `string` | ❌       | Role of contributor(s)   |
| `createdAt` | `string` | ✅       | Record creation timestamp|

Nine other tables retain their Comments columns as they contain useful reference information, format specifications, and type clarifications.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>empty columns in README.md table(s)</issue_title>
<issue_description>At least one README.md table has an empty Comments column. Any empty columns in this file should be removed.</issue_description>

Comments on the Issue (you are @copilot in this section)

@aspiers @copilot fix this.

• Fixes empty columns in README.md table(s) #45

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