Blog Category System + Post 6 Reframing Complete

Context

Started with the goal of Sprint 86 carryover (Post 6 reframing) + introducing a new category system. Performed parallel agent orchestration with 3-wave dispatch (Scribe → Herald/Palette → Scribe).

Decisions

D1: Post 6 (session-policy-sync) KR/EN Reframing Complete

Change commit: 195c839

• Removed series footer blockquote (7-post links + previous post links)
• Converted 5 MDX custom components → standard Markdown:

Component	Conversion Method
<MetricGrid>/<MetricCard>	Markdown table (label/value/hint columns)
<Mermaid caption="...">	```mermaid ``` code block + bold caption
<PhaseTimeline>/<PhaseMilestone>	Numbered list (phase title — period)
<Callout type="warn">	> **⚠️ Title** blockquote

• Added AI context: "In a structure with 12 agents working in parallel, this type of state mismatch is a bug that's hard to catch without seeing the whole picture at once"

D2: Category Data Layer

Change commit: 12c14cd

• Category = 'journey' | 'challenge' union type + parseCategory() function (fallback: journey)
• Added category: Category field to PostMeta
• i18n: categoryAll, categoryJourney, categoryChallenge (ko/en)
• Inserted category field in 12 MDX frontmatters (Post 1~5: journey, Post 6: challenge)

D3: CategoryTabs Component

Change commit: 82abecd

• Toss-style horizontal tab Client Component (category-tabs.tsx)
• Active tab bottom 2px brand bar indicator
• Accessibility: role="tablist", role="tab", aria-selected, roving tabindex

D4: Category Filter UI + HomePage Integration

Change commit: 6464497

• PostListWithFilter Client Component: useState<Category|'all'>('all') filter state
• PostCard: category badge next to date (journey → bg-brand-soft text-brand, challenge → bg-amber-50 text-amber-700)
• HomePage: Server Component maintained, <ul> → <PostListWithFilter> replaced

D5: Build Verification — Passed

cd blog && npm run build — 17 static pages, SSG normal.

Outcome

Item	Commit	Agent
Post 6 KR/EN reframing	195c839	Scribe
Category data layer	12c14cd	Herald
CategoryTabs component	82abecd	Palette
Filter UI + HomePage integration	6464497	Herald
Sprint 87 ADR	4467788 → updated	Scribe → Oracle