ci(packaging): publish only the tagged pypi package

[jromualdez-scale]

Summary

• Publishes only the package implied by the component release tag (agentex-client-v* or agentex-sdk-v*).
• Adds a manual workflow input for intentional all, agentex-client, or agentex-sdk publishes.
• Prevents a client release from trying to republish an existing SDK wheel with the same version.

Test plan

• bash -n bin/publish-pypi
• Checked IDE diagnostics for the edited workflow/script files.

Notes

This prevents the PyPI immutability failure mode. It does not, by itself, solve release-please source attribution for src/agentex/lib/**; that still needs a structural source move under adk/ or custom release attribution.

This intentionally uses a non-releasing PR title (ci) so the tooling-only change does not create a new client release. For future releases where both components bump, the component tags will publish in separate runs; the previous script attempted slim-before-heavy atomicity in one run, but that is what exposed sibling-wheel republish collisions.

Greptile Summary

This PR narrows PyPI publishing to the requested package. The main changes are:

• Adds a manual workflow choice for all, agentex-client, or agentex-sdk publishes.
• Passes the selected package into the publish script through PYPI_PACKAGE.
• Infers the publish target from component release tags when no manual input is set.
• Publishes only the selected wheel, with all preserving client-before-SDK order.

Confidence Score: 5/5

The change is narrowly scoped to publishing target selection and does not alter runtime package code.

The edited workflow and script align with the intended tag/manual-input behavior, and no blocking issues were identified in the changed files.

T-Rex Logs

What T-Rex did

• The base workflow was analyzed and found to have a workflow_dispatch trigger but no package input and no PYPI_PACKAGE environment variable, and all test scenarios invoked uv publish for both dist/agentex_client-...whl and dist/agentex_sdk-...whl.
• The head workflow was updated to define workflow_dispatch.inputs.package with choices all, agentex-client, and agentex-sdk, and it passes PYPI_PACKAGE: ${{ inputs.package }} to the publish step.
• Execution results showed that publishing with the three scenarios produced the expected wheel outputs: agentex-client-v1.2.3 published only the client wheel, agentex-sdk-v1.2.3 published only the SDK wheel, and manual PYPI_PACKAGE selections published the corresponding wheels; invalid or missing tags exited with an error.

_{Ran code and verified through T-Rex}

_{Reviews (2): Last reviewed commit: "fix(packaging): publish only the tagged ..." | Re-trigger Greptile}