feat(client)+feat(daemon): eq.names, @eq.command, E90/E157 RPCs

Python client:
- eq.names.event.* / .alarm.* / .command.* / .var.* / .constant.*  —
  autocomplete-able, typo-safe name lookup backed by the Describe RPC
  (lazy, cached; AttributeError on bad name with close-match hints)
- @eq.command decorator — binds a handler by function name, validated
  against the equipment's real command set at decoration time
- eq.report_substrate() — E90 wafer milestone reporting
- eq.report_module() — E157 module state reporting (auto-create)

Daemon (C++ service):
- ReportSubstrate RPC — drives E90 location + processing FSMs
- ReportModule RPC — drives E157 module FSM (auto-create on first report)
- ack_from_outcome() helper — consistent Ack mapping for read_sync results

Proto: SubstrateReport, ModuleReport, EquipmentDescription,
       SpoolFlushRequest, TerminalMessage; Describe, FlushSpool,
       SendTerminalMessage RPCs

Tests: C++ FSM test (journey + ghost rejection + E157 illegal jump);
       interop coverage for names API and E90/E157 round-trip

Docs: ch42 RPC table + Python example updated; ch16 daemon-path section added

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

proto/secsgem/v1/equipment.proto

@@ -91,6 +91,17 @@ service Equipment {
   // as CarrierAction.
   rpc ReportCarrier(CarrierState) returns (Ack);
 
+  // E90 — substrate (wafer) tracking. Report each milestone of a wafer's
+  // journey; the daemon drives the E90 FSMs and emits the standard CEIDs to
+  // the host. ARRIVED creates the substrate. Only for tools that track
+  // individual substrates.
+  rpc ReportSubstrate(SubstrateReport) returns (Ack);
+
+  // E157 — module process tracking. Report a module's execution state; the
+  // daemon drives the E157 FSM and emits the standard CEIDs. The module is
+  // auto-created on first report. Only for tools with tracked modules.
+  rpc ReportModule(ModuleReport) returns (Ack);
+
   // ---- Diagnostics --------------------------------------------------------
 
   // Live daemon/link status: distinguishes "host went offline" from "cable
@@ -278,6 +289,33 @@ message Health {
   }
 }
 
+// ---- Material tracking (E90 / E157) ----------------------------------------
+
+message SubstrateReport {
+  string substrate_id = 1;
+  Milestone milestone = 2;
+  string carrier_id = 3;   // optional; recorded on ARRIVED
+  uint32 slot = 4;         // optional; 1-based slot within the carrier
+  enum Milestone {
+    ARRIVED        = 0;    // create; AtSource / NeedsProcessing
+    AT_WORK        = 1;    // picked up for processing
+    PROCESSING     = 2;    // processing started
+    PROCESSED      = 3;    // processing finished
+    AT_DESTINATION = 4;    // returned / deposited
+  }
+}
+
+message ModuleReport {
+  string module_id = 1;
+  State state = 2;
+  enum State {
+    NOT_EXECUTING     = 0;
+    GENERAL_EXECUTING = 1;
+    STEP_EXECUTING    = 2;
+    STEP_COMPLETED    = 3;
+  }
+}
+
 // ---- Diagnostics & operations -----------------------------------------------
 
 message EquipmentDescription {