Replace Gutenberg question-mark dates with definitive dates at L711

[MaggieAppleton]

Parent plan

#94

What to build

In src/content/essays/block-party.mdx at line 711, both Gutenberg dates carry (?) uncertainty markers:

Wordpress started work on Gutenberg in 2017(?) and released its first version in 2018(?).
```

Real dates are known: Gutenberg was announced in June 2017; Phase 1 shipped in WordPress 5.0 on December 6, 2018. Replace the line with definitive, sourced dates and remove all `(?)` markers:

```
WordPress announced Gutenberg in June 2017 and shipped it as part of WordPress 5.0 on December 6, 2018.

Acceptance criteria

• No (?) markers remain on or near the Gutenberg line
• The announcement date reads as June 2017 (no hedging)
• The release date reads as December 6, 2018 (or December 2018 at minimum, no hedging)
• File renders without MDX errors

Blocked by

None — can start immediately
Related to #94

Generated by Plan issue → sub-issues for issue #94 · ● 137.2K · ◷

[MaggieAppleton]

Pull request created: #124

Generated by Implement sub-issue → PR

[MaggieAppleton]

Implemented and PR opened. The single line at L711 has been updated to remove all (?) markers with confirmed dates:

WordPress announced Gutenberg in June 2017 and shipped it as part of WordPress 5.0 on December 6, 2018.

PR: #[fix/gutenberg-dates-112] — see the pull request for details.

Generated by Implement sub-issue → PR for issue #112 · ● 43.5K · ◷

[MaggieAppleton]

Sub-issues created

This plan has been sliced into 1 sub-issue (the plan is already an atomic, single-line content fix — no further decomposition warranted):

#	Title	Label
#131	Replace Gutenberg uncertainty markers with definitive dates in block-party.mdx	ready-to-implement

All sub-issues are ready-to-implement — no human input required before an implementer agent can pick them up.

Generated by Plan issue → sub-issues for issue #112 · ● 78.6K · ◷