docs: bring the documentation up to the daemon/client era

A large gap had opened between the docs and the code: the README and
INTEGRATION guide did not mention the gRPC daemon or the Python client at
all (the entire vendor surface), ARCHITECTURE still described secs_server
as the ~1200-line canonical wiring example (it is a ~110-line thin main
over EquipmentRuntime), and test counts across six files were stale
(445/2753 -> 473/3087 core + the separate 125-assertion daemon suite).

- README: new "Integrating your tool (pick a tier)" section — Python
  client / any-language gRPC / embedded C++ — plus daemon tests and
  tools/run_interop.sh in the Testing section.
- ARCHITECTURE: layer diagram gains the vendor-surface and
  EquipmentRuntime/default_handlers tiers; stale wiring row fixed.
- INTEGRATION: three-tier chooser up front (this guide = the C++ tier).
- ch30 tour: secs_gemd + secs_gemd_tests in the binaries table.
- ch31: example alarm used a nonexistent `alcd:` field with bit 7 set
  (which the validator forbids) -> real `category:`/`name:` fields, and
  the roles: block documented.
- ch35: handler-location note now points at default_handlers.cpp's 15
  per-capability register_* functions.
- ch40: built-artifacts list + sample output counts.
- ch50: secsgem::gem runtime/default_handlers/handler_slot/name_index
  includes + new secsgem::daemon namespace section.
- PROOFS: test-count table gains the runtime/handlers/daemon row so the
  tally adds up; daemon suite noted. VERIFICATION/COMPLIANCE counts.
- interop/README: the one-command runner + the two daemon-track harnesses
  (daemon_interop, pyclient_interop).

Audited via a docs-vs-code sweep (the audit itself under-reported: it
validated counts textually; reality was 473/3087).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

docs/PROOFS.md

@@ -5,7 +5,7 @@ implements what [COMPLIANCE.md](COMPLIANCE.md) claims.
 
 | # | Command                                                                                          | What it proves                                                                              |
 |---|--------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------|
-| 1 | `docker compose run --rm tests`                                                                  | **445 test cases / 2 753 assertions** pass: every store, FSM, codec, parser, persistence path |
+| 1 | `docker compose run --rm tests`                                                                  | **473 test cases / 3 087 assertions** pass: every store, FSM, codec, parser, persistence path |
 | 2 | `docker compose run --rm builder /app/build/secs_conformance --host server --port 5000`          | **47 wire-level conformance checks** PASS against a live passive equipment                  |
 | 3 | `docker compose run --rm interop python3 /app/interop/host_vs_cpp_server.py --host server`      | **31 interop checks** PASS against secsgem-py 0.3.0 (the Python reference impl)             |
 | 4 | `SECSGEM_ROBUSTNESS_SOAK=1 docker compose run --rm builder /app/build/secsgem_tests -tc='*soak*'` | **100 000 random tool operations** execute with all invariants and persistence round-trips holding |
@@ -16,7 +16,7 @@ implements what [COMPLIANCE.md](COMPLIANCE.md) claims.
 
 CI ([Gitea Actions](.gitea/workflows/ci.yml)) runs a Release build +
 full suite and a separate `-fsanitize=thread` lane on every push to
-`main`.  All 445 cases / 2 753 assertions pass under TSan clean.
+`main`.  All 473 cases / 3 087 assertions pass under TSan clean.
 
 ## Per-standard test coverage
 
@@ -41,10 +41,13 @@ Every claimed standard has dedicated tests.  Counts are
 | **E157** — module process tracking | `test_modules`                                                                            |   5 |
 | **E84** — parallel I/O + timers   | `test_e84`, `test_e84_ports`, `test_e84_timers`, `test_e84_asio_timers`                    |  27 |
 | Persistence + cross-cutting       | `test_job_persistence`, `test_persistence_upgrade`, `test_wire_ceid_emission`, `test_gem300_scenario`, `test_live_gem300`, `test_thread_safety`, `test_metrics_prometheus`, `test_robustness_fuzz` |  32 |
-| **Total**                          |                                                                                            | **445** |
+| Runtime / handlers / daemon glue  | `test_runtime`, `test_default_handlers`, `test_handler_conformance` (53-handler sweep + golden frames), `test_name_index`, loader/validator additions |  28 |
+| **Total**                          |                                                                                            | **473** |
 
 `docker compose run --rm builder /app/build/secsgem_tests --list-test-cases | wc -l`
-currently reports 445.
+currently reports 473.  The gRPC daemon has its own binary on top:
+`secs_gemd_tests` (in-process gRPC service tests, 125 assertions, also run
+under ThreadSanitizer in CI).
 
 ## Categories of evidence