phase 0 setup: agent defs cleaned, AGENTS.md, initial phase-0.md draft

- sdd_process.md + coordinator.md: stale @alkdev/alkblobs name from the
  copy fixed to @alkdev/alkstore
- implementation-specialist.md: copied alkcall-family conventions
  (OperationEnv, vendored core types, BAST/wire formats) replaced with
  crate-neutral rules + an ADR-escalation rule
- code-reviewer.md: stale tls/iroh/acme feature list removed; anyhow
  posture corrected; db-specific review checks added
- AGENTS.md: phase-0 posture (no crate yet, no README, POC/discipline
  conventions, OQ-ST-NN register, reference checkouts)
- docs/research/phase-0.md: initial draft — vision, prior art (honker,
  pgboss-rs read incl. verified pgboss-rs LISTEN/NOTIFY absence), open
  questions OQ-ST-01..08, phase 0 plan

docs/sdd_process.md

@@ -2,7 +2,7 @@
 
 ## Overview
 
-This document defines the SDD process for the @alkdev/alkblobs package. It
+This document defines the SDD process for the @alkdev/alkstore package. It
 leverages:
 
 - **OpenCode CLI** as the agent execution environment