docs(canon): name the last two callings — Reaver, Bloodsworn

All seven callings are now named; no [CANON-TBD] remains in the specs.

Reaver (Barbarian). To reave is to raid — occupational, like Sellsword and
Trapper, naming what he does for money rather than what he is inside. That is
the rule the five mock names already obeyed and that §8's own list broke: a
calling is what a village calls you, not what a rulebook calls you. Bearsark
and Wildman were rejected for naming a condition; Breaker for being generic.

Bloodsworn (Warlock) was not a new coinage — the cosmology minted it a day
after the races spec was written ("what the Margreave calls bloodsworn",
rule.blood-price), and the cosmology spec had already applied it. It is the
exact FTH-axis mirror of Bonesetter: one channels the Warden, one pacts a king
of the Seven. Accepted cost, recorded in the spec: alone among the callings it
names a condition rather than a trade — the villain who pacts Ghaul is
bloodsworn too. A second, occupational word (Cursewright, Hexman) was
considered and rejected as a distinction the player will never feel.

Also retires the stale "reconcile class names" note on M4 and records the two
contract migrations that milestone owes: the canon log's `race` field, and the
deserter origin's dead allowed_classes.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QYa9u7Kdxv5gX4AnwWexy8

content/roadmap.md

@@ -158,10 +158,12 @@ Not a debt. Where ideas go to be safe.
   other six kings as campaign patrons; tiered enemy families (proximity to a king *is*
   the power scale); the three story-shapes (cult cell → cult that owns a city → the
   king himself).
-- **The Barbarian ⚔ calling name** (`[CANON-TBD]`).
 - **AI-generated worlds** (v2, charter §17). The saga spec guarantees the `Saga`
   object is what will feed it. Nothing else about it is decided.
 
+*(Left the Backlog 2026-07-12: the Barbarian ⚔ calling name — **Reaver**. All seven
+callings are named; see the [races/classes spec](../docs/superpowers/specs/2026-07-11-races-and-classes-design.md) §4.)*
+
 ---
 
 ## Notes for whoever authors next