Feat v0.9.6 deprecate stage_type, collapse stage_mode

stage_type no longer validated — starlark_hook presence determines
automation. stage_mode collapsed from 4→3 values (form/delegated/
automated); "review" mapped to "form" on input for backward compat.
Migration 018 converts existing rows. Review surface removed (~110
lines). 4 package manifests updated.

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

CHANGELOG.md

@@ -2,6 +2,36 @@
 
 All notable changes to Armature are documented here.
 
+## v0.9.6 — Deprecate stage_type, Collapse stage_mode
+
+Simplifies the workflow stage classification model by removing
+redundant fields.
+
+**stage_type deprecated**
+
+- No longer validated on input; any value accepted, defaults to "simple"
+- Existing manifests parsed for backward compatibility
+- DB column retained; export no longer includes the field
+- `starlark_hook` presence (not `stage_type`) determines automation
+
+**stage_mode collapsed (4 → 3 values)**
+
+- "review" removed as valid mode; mapped to "form" on input
+- Existing DB rows migrated: review → form
+- Review surface removed from workflow.html (~110 lines); signoff system
+  in `stage_config.validation` handles review behavior
+- Valid modes: form, delegated, automated
+
+**DB migration 018**
+
+- Postgres: UPDATE + CHECK constraint replacement
+- SQLite: UPDATE only (CHECK stays broad)
+
+**Package manifests updated**
+
+- bug-report-triage, content-approval, employee-onboarding,
+  webhook-notifier: review → form, stage_type removed
+
 ## v0.9.5 — Typed Forms → SDK Primitive
 
 Promotes the typed form system from a workflow-only model to a reusable