fix(ci): make tests portable across homes and distros

[tom-sapletta-com]

Prerequisite for governance adoption PR #1.

The test fixtures previously embedded /home/tom while production expands the current user home. The Docker workflow also reinstalled test dependencies at runtime and invoked the non-portable python alias.

Changes:

• derive user-specific Chrome, Cursor, VS Code, npm, and Steam fixture paths from pathlib.Path.home()
• use python3 -m pytest in every distro container
• remove the redundant runtime pip install; each image already installs .[dev]
• no application behavior, version, tag, release, or Docker network changes

Validation:

• 50 focused tests passed
• full suite via Goal: 460 passed, 5 skipped, 16 deselected
• Ruff passed for both changed test files
• Fedora, Ubuntu, and Debian images: 291/291 unit tests each
• Docker builds used --network host; runs used --network none

Delivery head: 1440421905672a9874565d89d846dce1dc7d1ef2

[ifuri-validator-agent]

Deterministic Validator approval for exact head 1440421905672a9874565d89d846dce1dc7d1ef2.

Ticket: ticket-001
Correlation ID: fixos-pr-2-ticket-001
Model: openrouter/z-ai/glm-5.2
Reviewed diff chunks: 1
Advisory LLM verdict: APPROVE
Advisory summary: Reviewed all 1 diff chunk(s). Test fixture paths are made portable by deriving home directories from pathlib.Path.home(), and the CI workflow switches to python3 -m pytest while removing redundant runtime pip installs. All reported checks pass and no security issues are present.
Advisory findings: none
The LLM output above is advisory and was not used as the approval trust root.
Merge will be attempted after this approval when explicitly authorized.

Decision record (recomputable)

DECISION D-001-8717
TICKET ticket-001
HEAD_SHA 1440421905672a9874565d89d846dce1dc7d1ef2
CORRELATION_ID fixos-pr-2-ticket-001
ACTOR agent:ifuri-validator-agent[bot]
APPLIED_RULE P-CORE-015
INPUT author_login = "tom-sapletta-com"
INPUT observed_checks = ["test-summary=PASS","test-arch=PASS","test-debian=PASS","test-fedora=PASS","test-alpine=PASS","test-ubuntu=PASS","test (3.12)=PASS","test (3.10)=PASS","test (3.11)=PASS"]
INPUT required_checks = ["test (3.10)","test (3.11)","test (3.12)","test-summary"]
INPUT required_checks_source = "env/request"
INPUT reviewer_login = "ifuri-validator-agent[bot]"
VERDICT APPROVE AUTHORITY DETERMINISTIC
REJECTED REQUEST_CHANGES BECAUSE NO_UNSAFE_CHANGE_REASON_FOUND
ADVISORY llm_verdict = "APPROVE" MODEL "openrouter/z-ai/glm-5.2"
ASSERT VERDICT_AUTHORITY != "ADVISORY"