docs: add repo-local project memory under .claude/memory/

Versioned, per-topic project memory (index + entries): IIOS overview, the generic-safety
rule, run/test + the replay.spec flake workaround, recent features (Supabase auth,
reactions/pins/saves, mentions, media, notifications), the chat-web consumer, and workflow
conventions. CLAUDE.md points to it as the accumulating-notes companion to the canonical rules.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.claude/memory/MEMORY.md

@@ -0,0 +1,12 @@
+# IIOS Project Memory — Index
+
+Repo-local, versioned project memory. The full canonical rules are in the repo root
+**`CLAUDE.md`**; these files are granular, per-topic memories that accumulate across sessions.
+Read the relevant ones before working in that area; add/update files as the project evolves.
+
+- [project_iios_overview.md](project_iios_overview.md) — what IIOS is (generic interaction OS; kernel + specializations + platform ports)
+- [feedback_generic_safety.md](feedback_generic_safety.md) — THE #1 rule: no chat/domain vocabulary in the kernel
+- [reference_run_and_test.md](reference_run_and_test.md) — run command, isolated `iios_test` DB, and the `replay.spec` flake workaround
+- [project_recent_features.md](project_recent_features.md) — the "real-providers" era: Supabase auth, reactions/pins/saves, mentions→inbox, media, notifications
+- [reference_chat_web_consumer.md](reference_chat_web_consumer.md) — chat-web is the reference app driving IIOS feature work
+- [feedback_workflow.md](feedback_workflow.md) — commits (email + co-author), IIOS_DEV_TOKENS off in prod, TDD, build-before-restart