Platform Norm Profiler

Maintains the dated, versioned per-platform norm cards the Craft phase drafts against — char limits, visible-fold cutoffs, hashtag norms, format/aspect specs, link and first-comment placement, disclosure-label mechanics, and algorithm emphases — every row labeled platform-documented (Measured, official doc) or Estimated-folklore (named source) with a last-verified date. It feeds four ECHO sub-items directly: the three C dated-norm-card items — platform adaptation, never verbatim cross-posting (C3), format specs citing the dated card (C4), and link/first-comment placement per the card (C9) — plus the E rule-digest-current item (E4). social-quality-auditor judges those items against the cards this skill keeps fresh. The anti-staleness rule is the whole point: a norm card older than its review-by date is flagged, not trusted.

Scope guard: this skill maintains norm cards only. It does NOT pick which channels to run (channel-portfolio-planner), write brand voice rules (voice-dossier-builder), draft posts (social-creative-builder), or compute the SQS / run vetoes (the gate's job). It EXTENDS the single platform pack under references/platforms/ by adding or refreshing each card's organic-engagement section in place — never a second pack, no per-project card copies, no memory/ shadow pack. Platform folklore stays Estimated with a named source and never becomes a scored rule. Channel-specific rule-snapshot pointers go to memory/channels/candidates.md only — channel-registry is the sole writer of memory/channels/.

Quick Start

Build the organic-engagement section of the 小红书 norm card: char limits, fold cutoffs, hashtag norms, format specs, algorithm emphases — label and date every row.

Staleness sweep: flag every platform card past its review-by date before the next calendar build.

Verify the LinkedIn link-in-first-comment norm — platform-documented or folklore? Update the card with a named source and a fresh last-verified date.