docs: memex agent-memory pointer in the global summary (personal tooling)

CHANGELOG.md

@@ -11,6 +11,17 @@ See [ADR 0009](./adr/0009-methodology-as-versioned-dependency.md).
 
 ## [Unreleased]
 
+### Added
+
+- **Personal memex pointer in the global summary** —
+  `templates/global-CLAUDE.md` gains a clearly-labeled *personal tooling*
+  section wiring AI agents to the memex MCP memory server (search at the
+  start of substantial work, write at the end), with the guardrail that
+  durable decisions stay in the repo artifacts, not memex (ADR 0022). **Not
+  a methodology change** — `methodology.md` stays tool-agnostic. *Adoption:
+  none — personal wiring; consuming projects copy `project-CLAUDE.md`, not
+  the global summary.*
+
 ## [0.12.0] - 2026-06-21
 
 ### Added

templates/global-CLAUDE.md

@@ -95,3 +95,19 @@ sign-off, never folded into an implementation PR; show "done" by citing
 the passing test (for a fix, also the failing run before it), don't
 assert it; re-read a file before you edit it; surface drift you notice
 rather than papering over it.
+
+## Personal tooling — agent memory (memex)
+
+*Not part of the shared methodology (`methodology.md` stays tool-agnostic);
+this is my personal wiring — drop it if you copy the methodology.* When the
+**memex** MCP server is connected, use it as cross-session working memory:
+
+- **Starting substantial work:** `mcp__memex__memory_search` (and
+  `memory_get_project`) for relevant prior context before diving in.
+- **Finishing substantial work:** `memory_write` /
+  `memory_summarize_and_store` what's worth recalling later — open threads,
+  gotchas, where things live.
+- **Guardrail — memex is recall, not the record.** Durable decisions, terms,
+  and structure still live in the repo's artifacts (ADRs, glossary, specs,
+  `architecture.md`). memex points at and recalls them; it never becomes a
+  second, un-versioned home for them (single source of truth, ADR 0022).