Add Recall Knowledge DC and skill to PF2e stat blocks

Display Recall Knowledge line below trait tags showing DC (from level
via standard DC-by-level table, adjusted for rarity) and associated
skill derived from creature type trait. Omitted for D&D creatures and
creatures with no recognized type trait.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

specs/004-bestiary/spec.md

@@ -103,6 +103,11 @@ As a DM running a PF2e encounter, I want to click a spell name in a creature's s
 
 A click on any spell name in the spellcasting section opens a popover (desktop) or bottom sheet (mobile) showing the spell's description, level, traits, range, action cost, target/area, duration, defense/save, and heightening rules. The data is read directly from the cached creature data (already embedded in NPC JSON from Foundry VTT) — no additional network fetch is required, and the feature works offline once the source has been loaded. Dismiss with click-outside, Escape, or (on mobile) swipe-down.
 
+**US-D5 — View Recall Knowledge DC and Skill (P2)**
+As a DM running a PF2e encounter, I want to see the Recall Knowledge DC and associated skill on a creature's stat block so I can quickly tell players the DC and which skill to roll without looking it up in external tools.
+
+The Recall Knowledge line appears below the trait tags, showing the DC (calculated from the creature's level using the PF2e standard DC-by-level table, adjusted for rarity) and the skill determined by the creature's type trait. The line is omitted for creatures with no recognized type trait and never shown for D&D creatures.
+
 ### Requirements
 
 - **FR-016**: The system MUST display a stat block panel with full creature information when a creature is selected.
@@ -148,6 +153,10 @@ A click on any spell name in the spellcasting section opens a popover (desktop)
 15. **Given** the spell description bottom sheet is open on mobile, **When** the DM swipes the sheet down, **Then** the sheet dismisses.
 16. **Given** a creature from a legacy (non-remastered) PF2e source has spells with pre-remaster names (e.g., "Magic Missile", "True Strike"), **When** the DM clicks one of those spell names, **Then** the spell description still displays correctly using the embedded data.
 17. **Given** a spell name appears as "Heal (×3)" in the stat block, **When** the DM looks at the rendered output, **Then** "Heal" is the clickable element and "(×3)" appears as plain text next to it.
+18. **Given** a PF2e creature with level 5 and common rarity is displayed, **When** the DM views the stat block, **Then** a "Recall Knowledge" line appears below the trait tags showing the DC calculated from level 5 (DC 20) and the skill derived from the creature's type trait.
+19. **Given** a PF2e creature with rare rarity is displayed, **When** the DM views the stat block, **Then** the Recall Knowledge DC is the standard DC for its level +5.
+20. **Given** a PF2e creature with the "Undead" type trait is displayed, **When** the DM views the stat block, **Then** the Recall Knowledge line shows "Religion" as the associated skill.
+21. **Given** a D&D creature is displayed, **When** the DM views the stat block, **Then** no Recall Knowledge line is shown.
 
 ### Edge Cases
 
@@ -156,6 +165,8 @@ A click on any spell name in the spellcasting section opens a popover (desktop)
 - Viewport resized from wide to narrow while stat block is open: the layout transitions from panel to drawer.
 - Embedded spell item missing description text: the popover/sheet shows the available metadata (level, traits, range, etc.) and a placeholder note for the missing description.
 - Cached source data from before the spell description feature was added: existing cached entries lack the new per-spell data fields. The IndexedDB schema version MUST be bumped to invalidate old caches and trigger re-fetch (re-normalization from raw Foundry data is not possible because the original raw JSON is not retained).
+- Creature with no recognized type trait (e.g., a creature whose only traits are not in the type-to-skill mapping): the Recall Knowledge line is omitted entirely.
+- Creature with a type trait that maps to multiple skills (e.g., Beast → Arcana/Nature): both skills are shown.
 
 ---
 
@@ -217,6 +228,11 @@ A DM wants to see which sources are cached, find a specific source, clear a spec
 - **FR-075**: PF2e creature abilities MUST have complete descriptive text in stat blocks. Stubs, generic feat references, and unresolved copy entries are not acceptable.
 - **FR-076**: The PF2e index SHOULD carry per-creature license tagging (ORC/OGL) derived from the Foundry VTT source data.
 - **FR-084**: The PF2e normalization pipeline MUST preserve per-spell data (slug, level, traits, range, time, target, area, duration, defense, description, heightening/overlays) from embedded `items[type=spell]` entries on NPCs, in addition to the spell name. This data MUST be stored in the cached source data and persisted across browser sessions.
+- **FR-085**: PF2e stat blocks MUST display a "Recall Knowledge" line below the trait tags showing the DC and the associated skill (e.g., "Recall Knowledge DC 18 • Undead (Religion)").
+- **FR-086**: The Recall Knowledge DC MUST be calculated from the creature's level using the PF2e standard DC-by-level table, adjusted for rarity: uncommon +2, rare +5, unique +10.
+- **FR-087**: The Recall Knowledge skill MUST be derived from the creature's type trait using the standard PF2e mapping (e.g., Aberration → Occultism, Animal → Nature, Astral → Occultism, Beast → Arcana/Nature, Celestial → Religion, Construct → Arcana/Crafting, Dragon → Arcana, Dream → Occultism, Elemental → Arcana/Nature, Ethereal → Occultism, Fey → Nature, Fiend → Religion, Fungus → Nature, Giant → Society, Humanoid → Society, Monitor → Religion, Ooze → Occultism, Plant → Nature, Undead → Religion).
+- **FR-088**: Creatures with no recognized type trait MUST omit the Recall Knowledge line entirely rather than showing incorrect data.
+- **FR-089**: The Recall Knowledge line MUST NOT be shown for D&D creatures.
 
 ### Acceptance Scenarios