proto: memory, the arguments of recall and memory and eight message kinds

Implemented-By: OpenCode session (model recorded in docs/implementer-log.md)

crates/proto/tests/fixtures/wire/memory_admin.json

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+{"v":1,"id":1,"final":true,"msg":{"kind":"memory_admin","body":{"command":"undo","arg":"2026-09-24-0007"}}}

crates/proto/tests/fixtures/wire/memory_admin_reply.json

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+{"v":1,"id":1,"final":true,"msg":{"kind":"memory_admin_reply","body":{"text":"undone: 2026-09-24-0007"}}}

crates/proto/tests/fixtures/wire/memory_block.json

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+{"v":1,"id":1,"final":true,"msg":{"kind":"memory_block","body":{}}}

crates/proto/tests/fixtures/wire/memory_block_reply.json

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+{"v":1,"id":1,"final":true,"msg":{"kind":"memory_block_reply","body":{"text":"# soul.md\nYou are Boxmaker.\n\n# memory.md (0 of 2,200 characters)\n(empty)\n\n# user.md (0 of 1,375 characters)\n(empty)"}}}

crates/proto/tests/fixtures/wire/memory_call.json

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+{"v":1,"id":3,"final":true,"msg":{"kind":"memory_call","body":{"request":{"session":"mm-r0000000000000000000000001","call":3,"tool":"memory","arguments":"{\"action\":\"note\",\"text\":\"example.org says March.\"}"},"taint":"private","untrusted":true}}}

crates/proto/tests/fixtures/wire/reindex.json

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+{"v":1,"id":1,"final":true,"msg":{"kind":"reindex","body":{}}}

crates/proto/tests/fixtures/wire/reindexed.json

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+{"v":1,"id":1,"final":true,"msg":{"kind":"reindexed","body":{"logs":42,"records":1208,"notes":7}}}

crates/proto/tests/fixtures/wire/session_updated.json

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+{"v":1,"id":1,"final":true,"msg":{"kind":"session_updated","body":{"session":"mm-r0000000000000000000000001"}}}