✨ Add spire:adepts roster skill

Shell-injected skill that derives an adept domain roster from workpad
frontmatter and journal filenames. Loaded by Igor at boot; any agent
may invoke it on demand for fresh discovery.

plugins/spire/skills/adepts/SKILL.md

@@ -0,0 +1,14 @@
+---
+name: adepts
+description: Lists the adept domains in the workpad — what each covers, when it was last active, its status. Loaded by Igor at boot; any agent may invoke it for a fresh listing.
+allowed-tools: Bash(bash:*)
+---
+
+<!-- Note: This skill uses Bash(bash:*) in allowed-tools — a novel pattern.
+     All other Spire skills use Bash(cat:*). The bash permission is needed
+     because the injection runs a script, not a simple cat. Per harness
+     design this should pre-approve the command at load time. -->
+
+!`bash "${CLAUDE_SKILL_DIR}/roster.sh"`
+
+<!-- Empty roster: no adepts/ folder yet, or /spire:init has not been run. -->

plugins/spire/skills/adepts/roster.sh

@@ -0,0 +1,47 @@
+#!/usr/bin/env bash
+# Roster generator for spire:adepts — derived metadata from adept domain folders.
+# Called via skill shell injection: !`bash "${CLAUDE_SKILL_DIR}/roster.sh"`
+#
+# Design principle: adepts write knowledge; tooling derives metadata. This
+# script reads frontmatter declared once and journal filenames that already
+# exist. No adept ever maintains an index, a counter, or a timestamp by hand.
+
+# Resolve workpad — same chain as spire:workpad, minus interactive steps.
+WP="${WORKPAD_FOLDER:-$(just workpad-folder 2>/dev/null)}"
+if [ -z "$WP" ]; then
+  # Try .claude/spire/project.md for an explicit Workpad: line
+  if [ -f .claude/spire/project.md ]; then
+    WP=$(sed -n 's/^- \*\*Workpad\*\*: *`\{0,1\}\([^` ]*\).*/\1/p' .claude/spire/project.md | head -1)
+  fi
+fi
+[ -z "$WP" ] && { [ -d docs/workpad ] && WP=docs/workpad || WP=.workpad; }
+[ -d "$WP/adepts" ] || { echo "## Adept roster — none (no $WP/adepts/)"; exit 0; }
+
+echo "## Adept roster — $WP/adepts/ ($(date +%F))"
+for dir in "$WP"/adepts/*/; do
+  [ -d "$dir" ] || continue
+  slug=$(basename "$dir")
+  [ "$slug" = "_template" ] && continue
+
+  # FC-6: Skip files without frontmatter early — avoid full-file reads through sed.
+  if ! head -1 "$dir/CLAUDE.md" 2>/dev/null | grep -q '^---$'; then
+    newest=$(ls "$dir"/journal/ "$dir" 2>/dev/null | grep -E '^[0-9]{4}-[0-9]{2}-[0-9]{2}-[0-9]{2}' | sort | tail -1 | cut -c1-13)
+    echo "- **$slug** — (unmigrated: no frontmatter) · last active ${newest:-never}"
+    continue
+  fi
+
+  fm=$(sed -n '2,/^---$/p' "$dir/CLAUDE.md" 2>/dev/null)
+  summary=$(echo "$fm" | sed -n 's/^summary: *//p')
+  status=$(echo "$fm" | sed -n 's/^status: *//p')
+  related=$(echo "$fm" | sed -n 's/^related: *//p')
+
+  # Recency and session count derived from journal filenames — nothing to maintain.
+  newest=$(ls "$dir"/journal/ "$dir" 2>/dev/null | grep -E '^[0-9]{4}-[0-9]{2}-[0-9]{2}-[0-9]{2}' | sort | tail -1 | cut -c1-13)
+  sessions=$(ls "$dir"/journal/ "$dir" 2>/dev/null | grep -Eo '^[0-9]{4}-[0-9]{2}-[0-9]{2}-[0-9]{2}' | sort -u | wc -l)
+
+  if [ -z "$summary" ]; then
+    echo "- **$slug** — (unmigrated: no frontmatter) · last active ${newest:-never}"
+  else
+    echo "- **$slug** — $summary · last active ${newest:-never} · $sessions session(s) · ${status:-active}${related:+ · related: $related}"
+  fi
+done