Support CSP IntEnum compatibility

[malhotrashivam]

• Update csp-gateway v3 for CSP IntEnum behavior introduced by csp.Enum retirement: add support for IntEnum as native c… csp#743.
• Preserve compatibility with legacy CSP enum values and enum-keyed channel baskets.
• Keep GatewayTestHarness unset assertions compatible with Pydantic GatewayStruct field-presence semantics.
• Optional v2.8.x equivalent, if another v2 release is needed: v2.8.1...investigate/csp-pr743-intenum-compat

Validation:

• make lint
• make test: 860 passed, 1 xfailed

[github-actions]

Test Results

854 tests  +12   844 ✅ +12   7m 26s ⏱️ -1s
  1 suites ± 0    10 💤 ± 0 
  1 files   ± 0     0 ❌ ± 0 

Results for commit d0f2ba6. ± Comparison against base commit 5f9168a.

This pull request removes 1 and adds 13 tests. Note that renamed tests count towards both.

csp_gateway.tests.config.test_load ‑ test_spaday_demo_configs_load

csp_gateway.tests.config.test_load ‑ test_legacy_demo_config_loads
csp_gateway.tests.server.gateway.csp.test_channels ‑ test_csp_enum_dict_basket_has_static_keys
csp_gateway.tests.server.modules.io.test_json_converter ‑ test_create_snapshot_dict_with_zero_valued_enum_key
csp_gateway.tests.server.web.test_spaday_ui.TestDarkBoot ‑ test_dark_choice_persists_across_reloads
csp_gateway.tests.server.web.test_spaday_ui.TestDarkBoot ‑ test_dark_seed_is_client_evaluated
csp_gateway.tests.server.web.test_spaday_ui.TestDefaultLayout ‑ test_custom_default_layout_replaces_generated_layout
csp_gateway.tests.server.web.test_spaday_ui.TestDefaultLayout ‑ test_schema_without_timestamp_or_id_stays_bare
csp_gateway.tests.server.web.test_spaday_ui.TestDefaultLayout ‑ test_schemas_add_legacy_parity_sort_and_columns
csp_gateway.tests.server.web.test_spaday_ui.TestSpadayPerspectiveLayoutActions ‑ test_layout_action_script_is_served
csp_gateway.tests.server.web.test_spaday_ui.TestSpadayPerspectiveLayoutActions ‑ test_layout_actions_are_available_without_server_layouts
…

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

❌ Patch coverage is 87.50000% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.61%. Comparing base (5f9168a) to head (d0f2ba6).
⚠️ Report is 14 commits behind head on main.

Files with missing lines	Patch %	Lines
csp_gateway/testing/harness.py	40.00%	6 Missing ⚠️
csp_gateway/server/gateway/csp/channels.py	90.47%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #322      +/-   ##
==========================================
+ Coverage   86.47%   86.61%   +0.14%     
==========================================
  Files         156      156              
  Lines       18276    18445     +169     
  Branches     1738     1744       +6     
==========================================
+ Hits        15805    15977     +172     
+ Misses       2471     2468       -3     

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