ci: drop the pydantic-ai v2 beta early-warning job (#359)

The v2-beta job was a non-blocking visibility signal, not a required
check. Removing it since it is no longer needed.

.github/workflows/main.yml

@@ -148,69 +148,6 @@ jobs:
       - run: uv sync --locked --group dev --all-extras
       - run: uv run --no-sync pytest
 
-  # Early-warning signal for the pydantic-ai v2 beta line. The harness targets
-  # the v1 line today (the `>=1.105.0` floor and the lock both resolve to v1),
-  # but that `>=` constraint also admits the v2 prereleases once prerelease
-  # resolution is enabled. This job pins the latest v2 beta so we see v2
-  # breakage as it lands -- e.g. v2 dropped the `calls` argument from
-  # `ToolManager.get_parallel_execution_mode`, which CodeMode still calls with
-  # the v1 signature -- rather than discovering it the day v2 is released.
-  #
-  # Deliberately absent from the `check` gate below: v2 is unreleased and the
-  # harness does not yet claim to support it, so a red result here is expected
-  # and must not block merges. It is a visible signal, not a required check.
-  test-v2-beta:
-    runs-on: ubuntu-latest
-    name: test on pydantic-ai v2 beta
-    timeout-minutes: 20
-    # The whole point of the job is to resolve v2 prereleases; allow them for
-    # every uv invocation in this job rather than threading flags per step.
-    env:
-      UV_PRERELEASE: allow
-    steps:
-      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
-        with:
-          persist-credentials: false
-
-      - uses: astral-sh/setup-uv@cec208311dfd045dd5311c1add060b2062131d57 # v8.0.0
-        with:
-          python-version: '3.14'
-          enable-cache: true # zizmor: ignore[cache-poisoning] -- Job does not produce release artifacts and does not have sensitive permissions
-          cache-suffix: v2-beta
-
-      # `env -u UV_LOCKED`: same as `test-latest` -- under the workflow-level
-      # `UV_LOCKED=1`, `uv lock` would assert the lockfile is current instead of
-      # applying the upgrade, so this step would fail the moment a newer v2 beta
-      # exists rather than testing it.
-      - run: |
-          env -u UV_LOCKED uv lock \
-            --prerelease allow \
-            --upgrade-package pydantic-ai-slim \
-            --upgrade-package pydantic-graph
-      - run: uv sync --locked --group dev --all-extras
-      # A v2 break can hang instead of failing cleanly: e.g. an unhandled
-      # exception raised inside a DBOS workflow leaves DBOS's background
-      # (non-daemon) recovery thread alive, so the Python process never exits
-      # and the step would otherwise ride to the 20-minute job timeout. The
-      # `timeout` wrapper caps the step so any such hang fails fast (exit 124)
-      # rather than burning a full runner slot. `-k 30` escalates to SIGKILL if
-      # pytest ignores the initial SIGTERM. A per-test plugin (pytest-timeout)
-      # would not catch this -- the hang happens after the test body finishes,
-      # during interpreter shutdown -- so the cap has to be on the process.
-      #
-      # Two instrumentation assertions depend on pydantic-ai v1's OpenTelemetry
-      # attribute and span names (`gen_ai.usage.*`, span `agent run`). v2 deliberately
-      # renamed these (aggregated-usage attributes, and GenAI-semconv span names
-      # such as `invoke_agent {name}`), so they are expected-red on v2 and carry
-      # no signal here. Deselect them so this job stays a meaningful early-warning
-      # for capability breakage (e.g. code mode) rather than documented
-      # instrumentation drift. If either test is renamed the deselect stops
-      # matching and the job goes red, which is the right prompt to revisit.
-      - run: |
-          timeout -k 30 300 uv run --no-sync pytest \
-            --deselect "tests/logfire_variables/test_managed_prompt.py::test_baggage_propagates_to_run_and_child_spans" \
-            --deselect "tests/logfire_variables/test_managed_prompt.py::test_provider_backed_resolution_tags_v1_instrumentation_spans"
-
   coverage:
     needs: [test]
     runs-on: ubuntu-latest