Content Audit: Verify upload docs and fix hashtag bug

- Audited `content/docs/guides/upload-content.md` against codebase.
- Verified claims regarding file types, size limits, permissions, and CORS.
- Fixed a bug in `js/services/videoNotePayload.js` where user-entered hashtags were dropped.
- Added regression test `tests/unit/services/videoNotePayload.test.mjs`.
- Generated audit artifacts.
- Created completion log.

Co-authored-by: PR0M3TH3AN <[email protected]>

context/CONTEXT_2026-02-18_00-02-50.md

@@ -0,0 +1,22 @@
+# Context: Content Audit & Bug Fix
+
+**Agent:** content-audit-agent
+**Date:** 2026-02-18
+**Goal:** Audit `content/docs/guides/upload-content.md` against codebase. Fix identified bug in NIP-71 hashtag handling.
+
+## Scope
+- `content/docs/guides/upload-content.md`
+- `js/services/videoNotePayload.js`
+- `js/ui/components/UploadModal.js`
+- `components/upload-modal.html`
+
+## Identified Issue
+Hashtags entered in the Upload Modal are collected as `{ t: [...] }` by `Nip71FormManager` (due to `data-nip71-list="t"`).
+However, `videoNotePayload.js`'s `normalizeNip71Metadata` only looks for `rawMetadata.hashtags`.
+This causes user-entered hashtags to be dropped during payload construction.
+
+## Plan
+1. Inventory and verify all claims in `upload-content.md`.
+2. Create a unit test to reproduce the hashtag bug.
+3. Fix the bug in `videoNotePayload.js` to support `t` alias.
+4. Verify fix with tests.