fix: resolve code-review findings (locally verified)

Server-054/055/056, Contracts-020/021/022, Tests-036/038/039,
IntegrationTests-030/031/032 (+033 deferred to live rig),
Client.Dotnet-026/028/029 (+027 won't-fix), Client.Go-030..034,
Client.Python-032..036, Client.Rust-033..038.

Key fix: SessionEventDistributor orphaned a subscriber that registered after
the pump completed but before disposal (Server-056) -> register paths now
complete late registrants under _lifecycleLock; regression test added. The
racy dashboard-mirror gRPC test made deterministic (Tests-039).

Verified green locally: gateway Tests targeted classes (GatewaySession,
SessionEventDistributor, GatewayOptionsValidator, ProtobufContractRoundTrip,
GatewaySessionDashboardMirror) + dotnet/go/python/rust client suites.

code-reviews/Client.Python/findings.md

@@ -7,7 +7,7 @@
 | Review date | 2026-06-16 |
 | Commit reviewed | `8df5ab3` |
 | Status | Re-reviewed |
-| Open findings | 5 |
+| Open findings | 0 |
 
 ## Checklist coverage
 
@@ -1463,13 +1463,13 @@ passed, 1 skipped, 0 warnings; previously 1 warning). The `tls`-marked
 | Severity | Low |
 | Category | Correctness & logic bugs |
 | Location | `clients/python/src/zb_mom_ww_mxgateway_cli/commands.py:1048,1065-1066` |
-| Status | Open |
+| Status | Resolved |
 
 **Description:** `_smoke` reintroduces the dead `closed = False` / `if not closed:` guard that Client.Python-004's resolution claimed to have removed via `async with session:`. `closed` is never reassigned, so the guard is always true. Behavior is correct (session always closed) but the dead variable misleads readers into expecting an early-close path. (Claimed regression — verify root cause.)
 
 **Recommendation:** Use `async with session:` or drop the `closed` variable and close unconditionally.
 
-**Resolution:** _(empty until closed)_
+**Resolution:** 2026-06-16 — Confirmed regression: the dead `closed = False` / `if not closed:` guard had returned. Replaced the `try/finally` with `async with session:` (Session implements the async context-manager protocol). Test: `test_smoke_does_not_carry_dead_closed_guard` in `tests/test_review_findings_032_to_036.py`.
 
 ### Client.Python-033
 
@@ -1478,13 +1478,13 @@ passed, 1 skipped, 0 warnings; previously 1 warning). The `tls`-marked
 | Severity | Low |
 | Category | Correctness & logic bugs |
 | Location | `clients/python/src/zb_mom_ww_mxgateway_cli/commands.py:772,1490-1494` |
-| Status | Open |
+| Status | Resolved |
 
 **Description:** `_parse_string_list` always emits `param_hint="--items"`, but it is also called from `_build_write_bulk_entries` with `kwargs["values"]`. An empty `--values ""` on the write-bulk commands yields `Error: Invalid value for '--items': ...`, pointing at a flag that doesn't exist on those commands.
 
 **Recommendation:** Add an optional `param_hint` parameter (default `--items`) and pass `--values` from the write-bulk caller.
 
-**Resolution:** _(empty until closed)_
+**Resolution:** 2026-06-16 — Added `param_hint="--items"` default param to `_parse_string_list`; `_build_write_bulk_entries` now passes `param_hint="--values"`. Tests: `test_parse_string_list_default_param_hint_is_items`, `test_parse_string_list_accepts_caller_supplied_param_hint` in `tests/test_review_findings_032_to_036.py`.
 
 ### Client.Python-034
 
@@ -1493,13 +1493,13 @@ passed, 1 skipped, 0 warnings; previously 1 warning). The `tls`-marked
 | Severity | Low |
 | Category | Correctness & logic bugs |
 | Location | `clients/python/src/zb_mom_ww_mxgateway_cli/commands.py:1497-1501` |
-| Status | Open |
+| Status | Resolved |
 
 **Description:** `_parse_int_list` does `int(item)` with no error handling. A non-numeric token (e.g. `--item-handles "10,abc"`) raises a raw `ValueError`, surfacing as an unformatted traceback interactively (other input errors raise `click.BadParameter`).
 
 **Recommendation:** Wrap the conversion and re-raise as `click.BadParameter(..., param_hint="--item-handles")`.
 
-**Resolution:** _(empty until closed)_
+**Resolution:** 2026-06-16 — Wrapped the `int()` comprehension in `try/except ValueError` and re-raise as `click.BadParameter(..., param_hint="--item-handles")`. Tests: `test_parse_int_list_non_numeric_raises_bad_parameter`, `test_parse_int_list_happy_path` in `tests/test_review_findings_032_to_036.py`.
 
 ### Client.Python-035
 
@@ -1508,13 +1508,13 @@ passed, 1 skipped, 0 warnings; previously 1 warning). The `tls`-marked
 | Severity | Low |
 | Category | Code organization & conventions |
 | Location | `clients/python/src/zb_mom_ww_mxgateway/__init__.py`, `.../options.py:63-77`, `.../galaxy.py:293` |
-| Status | Open |
+| Status | Resolved |
 
 **Description:** Two new public types — `BrowseChildrenOptions` (options.py) and `LazyBrowseNode` (galaxy.py) — are absent from `__init__.py`/`__all__`, so callers can't `from zb_mom_ww_mxgateway import BrowseChildrenOptions`, breaking the package-root import contract that `ClientOptions`/`GatewayClient`/etc. follow.
 
 **Recommendation:** Re-export both from `__init__.py` and add them to `__all__`.
 
-**Resolution:** _(empty until closed)_
+**Resolution:** 2026-06-16 — Re-exported `BrowseChildrenOptions` (from `.options`) and `LazyBrowseNode` (from `.galaxy`) in `__init__.py` and added both to `__all__`. Tests: `test_browse_children_options_is_exported_from_package_root`, `test_lazy_browse_node_is_exported_from_package_root` in `tests/test_review_findings_032_to_036.py`.
 
 ### Client.Python-036
 
@@ -1523,10 +1523,10 @@ passed, 1 skipped, 0 warnings; previously 1 warning). The `tls`-marked
 | Severity | Medium |
 | Category | Documentation & comments |
 | Location | `clients/python/README.md:143-158` |
-| Status | Open |
+| Status | Resolved |
 
 **Description:** The README "Browsing lazily" section's code example calls `galaxy.browse_children(...)`, a method that does not exist — the actual public low-level method is `browse_children_raw`. The example raises `AttributeError` at runtime. The README-parse test only covers shell CLI invocations, not Python code fragments, so it doesn't catch this.
 
 **Recommendation:** Update the example/prose to `browse_children_raw(...)` (and promote the high-level `browse()`/`LazyBrowseNode` path), or add a `browse_children` alias. Add a `hasattr` test to catch future renames.
 
-**Resolution:** _(empty until closed)_
+**Resolution:** 2026-06-16 — Updated the README "Browsing lazily" prose and example to `browse_children_raw(...)` and added a pointer to the higher-level `browse()`/`LazyBrowseNode` walker. Tests: `test_galaxy_client_exposes_browse_children_raw` (hasattr guard) and `test_readme_browse_example_uses_existing_method` (parses every `galaxy.<method>()` call in README against the client class) in `tests/test_review_findings_032_to_036.py`.