ci: run PR workflows on every base branch (probe)

[Fl0p]

Probe PR. Do not merge - it exists to prove that the trigger patch makes real build/lint/test jobs run on a pull request whose base is not main.

Base base/upstream-dev-flo896 is a verbatim snapshot of upstream/dev (80430fd2862bfb43a6b0b1993f57033e45a9b98b); the only diff is the one commit below.

What changed

.github/workflows/ci.yml and .github/workflows/smoke-test.yml: drop the branches: filter under pull_request:. push: stays pinned to main. 2 files, -2 lines, nothing else.

Why it has to live here

GitHub Actions resolves a pull_request workflow definition from the PR's own tree (head / merge commit), never from the default branch. Only schedule / workflow_dispatch / workflow_run / repository_dispatch are read from the default branch. So patching the fork's main alone produces zero runs on a PR into a review base.

Expected result

Lint (TS), the build jobs and Smoke Test (Mock Mode) appear with non-zero durations instead of only Labeler / Greetings / Validate PR Title. Red real jobs are an acceptable outcome here: the upstream ci.yml carries drift/parity gates that may not pass on a bare snapshot. The point is that the signal exists.

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[Fl0p]

Probe PR - its purpose was to prove that removing the branches filter under pull_request: makes real lint/build/test jobs run on a PR whose base is not main. It did (Lint (TS) 4m48s, Test Matrix both nodes, smoke-test pass). The patch is merged to main via #13; closing the probe and deleting its branches. The three red jobs are a defect in upstream snapshot 80430fd (FStringView missing from the native-discovery ue-shim), unrelated to the trigger change and tracked separately.