diff --git a/.opencode/agents/architect.md b/.opencode/agents/architect.md
index 01b0d4b..cfed6d3 100644
--- a/.opencode/agents/architect.md
+++ b/.opencode/agents/architect.md
@@ -116,9 +116,14 @@ All architecture documents use YAML frontmatter:
 ---
 status: draft | reviewed | stable | deprecated
 last_updated: YYYY-MM-DD
+notes: "optional one-line change summary"
 ---
 ```
 
+`last_updated` must be a bare date and any annotation text lives in `notes`.
+Both `notes` and multi-word values must be double-quoted — Gitea's frontmatter
+parser rejects unquoted scalars containing `: `.
+
 | Status | Meaning | Transitions |
 |--------|---------|-------------|
 | `draft` | Under active development. May change significantly. | → `reviewed` when open questions are resolved |
diff --git a/docs/architecture/README.md b/docs/architecture/README.md
index 4eb009e..e337960 100644
--- a/docs/architecture/README.md
+++ b/docs/architecture/README.md
@@ -1,6 +1,7 @@
 ---
 status: draft
-last_updated: 2026-10-11 (ADR-013 — family composition: no sibling dependency in-core, sweep-lease semantics, co-tenancy/no-cross-store-atomicity rulings, OQ-11 resolved, feature graph re-pinned to engine features)
+last_updated: 2026-10-11
+notes: "ADR-013 — family composition: no sibling dependency in-core, sweep-lease semantics, co-tenancy/no-cross-store-atomicity rulings, OQ-11 resolved, feature graph re-pinned to engine features"
 ---
 
 # alkblobs — Architecture
diff --git a/docs/architecture/backends-and-dispatch.md b/docs/architecture/backends-and-dispatch.md
index a6f83af..22d8498 100644
--- a/docs/architecture/backends-and-dispatch.md
+++ b/docs/architecture/backends-and-dispatch.md
@@ -1,6 +1,7 @@
 ---
 status: draft
-last_updated: 2026-10-11 (ADR-013 — feature graph re-pinned: engine features pull their own drivers; `kv`/`large` tier features retired, `sqlite` default-on, `local` ungated)
+last_updated: 2026-10-11
+notes: "ADR-013 — feature graph re-pinned: engine features pull their own drivers; kv/large tier features retired, sqlite default-on, local ungated"
 ---
 
 # Backends, tiers, and dispatch
diff --git a/docs/architecture/gc-and-namespaces.md b/docs/architecture/gc-and-namespaces.md
index b9671f1..cf4ce24 100644
--- a/docs/architecture/gc-and-namespaces.md
+++ b/docs/architecture/gc-and-namespaces.md
@@ -1,6 +1,7 @@
 ---
 status: draft
-last_updated: 2026-10-11 (ADR-013 — sweeper-lock semantics pinned as the named exclusive sweep lease; provider unchanged; composition boundary referenced)
+last_updated: 2026-10-11
+notes: "ADR-013 — sweeper-lock semantics pinned as the named exclusive sweep lease; provider unchanged; composition boundary referenced"
 ---
 
 # Pooling, namespaces, and GC
diff --git a/docs/architecture/open-questions.md b/docs/architecture/open-questions.md
index 6837f5d..f013c86 100644
--- a/docs/architecture/open-questions.md
+++ b/docs/architecture/open-questions.md
@@ -1,6 +1,7 @@
 ---
 status: draft
-last_updated: 2026-10-11 (ADR-013 round — OQ-11 resolved on in-tree evidence; the parked index is now empty)
+last_updated: 2026-10-11
+notes: "ADR-013 round — OQ-11 resolved on in-tree evidence; the parked index is now empty"
 ---
 
 # Open Questions
diff --git a/docs/architecture/ops-surface.md b/docs/architecture/ops-surface.md
index bb55737..b87d3ad 100644
--- a/docs/architecture/ops-surface.md
+++ b/docs/architecture/ops-surface.md
@@ -1,6 +1,7 @@
 ---
 status: draft
-last_updated: 2026-10-03 (ADR-012 §2 — put response {token, digest}; have token-renewal form; fetch verification wording; non-fleet token scope)
+last_updated: 2026-10-03
+notes: "ADR-012 §2 — put response {token, digest}; have token-renewal form; fetch verification wording; non-fleet token scope"
 ---
 
 # Ops surface (alkcall-backed network operations)
diff --git a/docs/architecture/overview.md b/docs/architecture/overview.md
index a1bf6f6..1a124d1 100644
--- a/docs/architecture/overview.md
+++ b/docs/architecture/overview.md
@@ -1,6 +1,7 @@
 ---
 status: draft
-last_updated: 2026-10-11 (ADR-013 — family composition & reactive boundary; OQ-11 resolved, feature graph re-pinned to engine features)
+last_updated: 2026-10-11
+notes: "ADR-013 — family composition & reactive boundary; OQ-11 resolved, feature graph re-pinned to engine features"
 ---
 
 # Overview
diff --git a/docs/architecture/requirements.md b/docs/architecture/requirements.md
index 1d0bf0c..5325da9 100644
--- a/docs/architecture/requirements.md
+++ b/docs/architecture/requirements.md
@@ -1,6 +1,7 @@
 ---
 status: draft
-last_updated: 2026-10-11 (ADR-013 composition round — REQ-5 added: the family's first consumers deploy this crate with the sibling reactive substrate; co-tenancy + liveness-form facts pinned)
+last_updated: 2026-10-11
+notes: "ADR-013 composition round — REQ-5 added: the family's first consumers deploy this crate with the sibling reactive substrate; co-tenancy + liveness-form facts pinned"
 ---
 
 # Requirements
diff --git a/docs/architecture/store-api.md b/docs/architecture/store-api.md
index fddffe4..56ca402 100644
--- a/docs/architecture/store-api.md
+++ b/docs/architecture/store-api.md
@@ -1,6 +1,7 @@
 ---
 status: draft
-last_updated: 2026-10-11 (ADR-013 — the fleet sweeper lock's semantics pinned as the named exclusive sweep lease; provider unchanged; composition boundary referenced)
+last_updated: 2026-10-11
+notes: "ADR-013 — the fleet sweeper lock's semantics pinned as the named exclusive sweep lease; provider unchanged; composition boundary referenced"
 ---
 
 # Store API