Same pattern as the google_chat lazy-load (PR #22681), applied to the
Teams plugin. The bundled `plugins/platforms/teams/adapter.py` did
`import httpx` at module top, which dragged the entire httpx +
httpcore stack into every process that triggered plugin discovery —
including `hermes` invocations that never instantiate the Teams
adapter.
`httpx` is only needed inside one method
(`TeamsMeetingPipeline._write_summary_via_incoming_webhook`), and the
`httpx.AsyncBaseTransport` parameter annotation is already string-only
thanks to the existing `from __future__ import annotations`. Move the
runtime import inside the method.
Measured impact (7-run medians, 9950X3D):
teams plugin alone: 118 → 89 ms (-25%)
46 → 38 MB (-17%)
import cli (full): unchanged
import model_tools: unchanged
The full-CLI numbers are flat because httpx is loaded transitively
from many other modules on that path. The microbench win is the real
signal: 29 ms / 8 MB shaved off any process that touches the teams
plugin without otherwise pulling httpx — primarily future workflows
where the gateway is enabled but Teams is not configured.
Tests: 44/44 `tests/gateway/test_teams.py` pass; 345 across all
plugin-platform suites (teams + qqbot + google_chat). The test file
imports `httpx` itself for the `MockTransport` fixture, which is
correct — tests legitimately use httpx, only the plugin's module-level
import was the issue.
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