fix(toolsets): restore terminal toolset on api_server and acp composites (#56732)

[HexLab98]

Summary

• Add read_terminal and close_terminal to hermes-acp and hermes-api-server composite tool lists in toolsets.py
• Fixes silent loss of the entire terminal toolset on api_server when _get_platform_tools() subset-inference compares against registry-merged terminal tools (hermes-api-server / hermes-acp lose the entire 'terminal' toolset (silent subset-check failure vs. read_terminal/close_terminal) #56732)
• Add regression tests for composite/terminal parity and api_server platform resolution

Test plan

• scripts/run_tests.sh tests/gateway/test_api_server_toolset.py tests/toolsets/test_composite_terminal_parity.py -q

Fixes #56732

[kshitijk4poor]

Thanks for this — your fix and regression tests were correct, and you covered both composites plus added the subset-parity test. We ended up merging #56887 (salvage of #56480 by @designnotdrum), which fixes the same bug (#56732) at the reverse-map layer in _get_platform_tools() via a new include_registry=False static-membership comparison, rather than adding the two tools to each composite's hand-written list. The root-cause approach means the bug class can't recur the next time a tool is registered into terminal/delegation/etc., so no composite needs per-tool maintenance.

Your symptom-level fix was sound and would have resolved the immediate breakage — closing only because the layer fix supersedes it. Credited in the salvage PR body. Thanks for the contribution!