docs: Add Tech Council election process documentation

[amithanda]

Description

This PR adds formal documentation for the Technology Council (TC) election process in TC_ELECTIONS.md and updates GOVERNANCE.md to link to it.

## Category (Required)


- [x] **Governance/Contributing**: Updates to GOVERNANCE.md, CONTRIBUTING.md, or CODEOWNERS. (Requires Governance Council approval)

  
## Checklist

- [x] I have followed the [Contributing Guide](https://github.com/Universal-Commerce-Protocol/.github/blob/main/CONTRIBUTING.md).
- [x] I have signed the CLA (if applicable).
- [x] I have updated the documentation (if applicable).
- [x] My changes pass all local linting and formatting checks.

[ptiper]

@amithanda I'd suggest adding TC_ELECTIONS.md to CODEOWNERS to ensure changes to it require a governance-council review?

[amithanda]

@amithanda I'd suggest adding TC_ELECTIONS.md to CODEOWNERS to ensure changes to it require a governance-council review?

Thanks for the suggestion. Added.

[igrigorik]

line wrap nit, otherwise 👍