docs(governance): add inclusive language, events, social media and media policies

[demilade18-git]

• Add an inclusive language guide for TeachLink Web #1767: added Governance/community/INCLUSIVE_LANGUAGE.md - preferred terms, terms to avoid, and how the guide is enforced.
• Add a community events policy for TeachLink Web #1768: added Governance/community/EVENTS_POLICY.md - how events are proposed, code-of-conduct applicability, and sponsorship rules.
• Add a social media policy for TeachLink Web #1769: added Governance/community/SOCIAL_MEDIA.md - who may post officially, tone and disclosure rules, and escalation.
• Add a press and media policy for TeachLink Web #1770: added Governance/community/MEDIA_POLICY.md - who speaks to media, the approval process, and messaging guidance.

Each issue is limited to its single new document inside Governance/ (no application code touched), written in the style and section layout of the existing governance policies. No companion test files were added: the issues ask for tests only "where applicable", and several comparable policy documents in this folder (for example COMMUNICATION_NORMS.md and DCO.md) have none. Cross-references point only at documents that already exist in the repository.

Nothing was installed, built or run; please verify in CI/review.

Closes #1767
Closes #1768
Closes #1769
Closes #1770

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