ci: lint and vet both platform modules

[cristim]

CI's dedicated lint and vet checks currently skip the separate tests/e2e module. Run both checks for . and tests/e2e, enabling its required e2e tag and reporting failures after checking both modules. Preserve the pinned lint installer, configuration validation, and cache path.

Closes #346.

Validation on macOS with Go 1.26.6 and golangci-lint 2.10.1 built with Go 1.26.6:

• Actual YAML commands pass for both modules. Root build and tagged e2e compile-only check pass.
• Real tagged e2e printf and misspell defects pass the original root-only commands and fail the revised vet/lint commands respectively. Both clean checks pass again after removing the fixtures.
• Eight independent shell probes verify module failures, configuration validation failures, exact tags, cache settings, and continued checks after a root failure.
• All normal commit hooks pass, including pinned actionlint/zizmor and security scans.
• Additive merge commit 45a1f0500512bb4dc45ae41e931af00b5ccd724a integrates main ac96148bf0c1ef8630aa16dc1d483b1092b69f7e. Fresh actual-YAML lint/vet, build, failure probes, and normal workflow hooks pass on the integrated tree.
• Independent adversarial review approved exact commit 45a1f0500512bb4dc45ae41e931af00b5ccd724a after reviewing the full diff and verification evidence. Reviewer: gpt-6-astra, explicitly authorized substitute for the unavailable project-pinned model.

Local act did not execute the job: the sandbox attempt failed on network lookup, and the Docker-enabled retry stalled pulling its runner image. The retry was stopped to release the shared build lock. Hosted Linux CI remains required. Static-analysis probes do not claim running HTTP e2e tests.

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Reviewing files that changed from the base of the PR and between ac96148 and 45a1f05.

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• .github/workflows/ci.yml

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