fix(about): resolve QA-rejected issues across 6 About section pages

[Copilot]

Six pages in the About section were rejected in QA review for exposing internal editorial notes, placeholder text, broken markers, and a markdown-leak heading. This PR resolves all identified issues.

Description

Removes all user-visible internal content from the About section pages flagged in QA review. No content rewrites — surgical removal of draft artefacts only.

Changes by file

• v2/about/concepts/livepeer-overview.mdx — Fixed typo incenticises → incentivises; removed <expandable title="Old notes"> block containing INSERT LIVEPEER ACTOR DIAGRAM HERE placeholder note and old draft actor descriptions
• v2/about/concepts/mental-model.mdx — Removed <Note> image would be good </Note> which was rendering as the first visible element on the page
• v2/about/protocol/livepeer-token.mdx — Removed #TODO from four section headings (Rewards Distribution, Governance, Treasury, Technical Mechanics); removed <Danger> box exposing "Move majority of this to token section…"; removed #MOVE THESE and #REVIEW inline markers; removed the unwritten "Economic Flow Diagrams" stub section
• v2/about/resources/compendium/livepeer-glossary.mdx + v2/about/resources/x-deprecated/livepeer-glossary.mdx — Removed <Note> A Searchable view would be ideal here </Note>; removed ## ==== heading that was leaking into the "On this page" sidebar; fixed three pre-existing etc. banned-phrase copy-lint blocking errors in both files
• v2/about/portal.mdx — No change; Whitepaper card link already correctly targets /v2/about/resources/knowledge-hub/livepeer-whitepaper

Scope

In scope:

• v2/about/concepts/livepeer-overview.mdx
• v2/about/concepts/mental-model.mdx
• v2/about/protocol/livepeer-token.mdx
• v2/about/resources/compendium/livepeer-glossary.mdx
• v2/about/resources/x-deprecated/livepeer-glossary.mdx

Out of scope: No routing changes, no frontmatter edits, no component changes.

Validation

node operations/scripts/validators/content/copy/lint-copy.js \
  v2/about/concepts/livepeer-overview.mdx \
  v2/about/concepts/mental-model.mdx \
  v2/about/protocol/livepeer-token.mdx \
  v2/about/resources/compendium/livepeer-glossary.mdx \
  v2/about/resources/x-deprecated/livepeer-glossary.mdx

# Result: lint-copy complete: 0 blocking, 2 pre-existing warnings (human sign-off) across 1 file

Parallel validation: Code Review ✅ · CodeQL ✅

Follow-up Tasks

• The two remaining WEAKENED_VALUE copy warnings in livepeer-overview.mdx are pre-existing and flagged for human sign-off per lint policy — not introduced by this PR.

Type of Change

• Bug fix (fixes an issue)
• Content update (improves existing content)
• Style/formatting fix

Related Issues

Related to #

Changes Made

• Removed all #TODO, #REVIEW, #MOVE THESE markers rendering as visible body text in livepeer-token.mdx
• Removed <Danger> box with internal editorial instruction from livepeer-token.mdx
• Removed <Note> and <expandable> blocks containing internal design/placeholder notes from livepeer-overview.mdx and mental-model.mdx
• Removed ## ==== markdown-leak heading and internal <Note> from both glossary files
• Fixed typo incenticises → incentivises

Testing

• Tested locally with npm run dev
• Verified all links work
• Checked formatting and style
• Reviewed against style guides

Checklist

• I've checked for broken links
• My changes are clear and easy to understand
• I've tested locally

Governance Approval

Not required for this PR.

Copy Governance Gate - L5

Auto-checked by CI (lint-copy.js + lint-structure.js)

• No Tier 1 banned words or phrases
• No unresolved {/* REVIEW: */} flags in rendered content
• No non-USD currency outside declared regional scope
• No empty cells in decision tables
• pageType, audience, lastVerified present in frontmatter

Human review required

Sequence (L2)

• Page opens with operator outcome - value kept, no conditionals
• Majority operator path is featured before variants
• Introduced paths are developed on-page or linked

Completeness (L3)

• Decision aids (tables, matrices, flowcharts) are complete - no placeholders
• Every warning or consequence is followed by a prevention action and link
• Primary actions and URLs appear in body copy (not only in accordions)

Tone (L4)

• No sentence ends on a hedge, disclaimer, or restatement
• No section ends with a Note that apologises rather than forward-points

Brief compliance

• L0 (Q1-Q4) was completed before drafting
• L1 persona mapping table was completed before drafting

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• edgedl.me.gvt1.com
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node node install.mjs (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)