Add export validation step to CI (Linux only)

[itsmiso-ai]

Adds a lightweight Linux export validation job to test.yml that runs on PRs, catching export_presets.cfg regressions before merge.

Fixes #233

Opened by foreman on review GO (workload wl-misospace-windowstead-233).

[its-saffron]

AI Automated Review

Full PR review.

Analysis engine: MiniMax-M2.7@https://litellm.jory.dev/v1 (anthropic) — escalated (fast_low_confidence)

PR Review: Add export validation step to CI (Linux only)

Recommendation: Approve

This PR implements the exact requirements from issue PR 233 cleanly and correctly.

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Change-by-Change Analysis

.github/workflows/test.yml — Added export-validation job (lines 218–272)

Step	What it does	Verification
actions/checkout	Checks out repo	Pinned SHA matches existing jobs in file
load-godot-toolchain	Provides Godot URL + checksums via existing action	Consistent with all other jobs
Download Godot	Fetches Linux binary, verifies SHA256, unzips to .tools/	set -euo pipefail enforced
Install export templates	Downloads .tpz, verifies SHA256, installs to ~/.local/share/godot/export_templates/	Mirrors release.yml exactly
Export Linux build	Runs Godot_v..._linux.x86_64 --headless --path . --export-release "Linux/X11" ./build/export-validation/linux/windowstead.x86_64	Uses correct preset name from export_presets.cfg
Verify export output	Checks binary and PCK are non-empty; fails CI with ::error:: if missing	Explicit non-zero size check ([ ! -s ])

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Linked Issue Fit

Acceptance Criterion	Status
CI runs an export validation step on PRs	✅ on: pull_request trigger, added to test.yml
Linux export succeeds or fails as part of PR checks	✅ Job runs on every PR, CI blocks on failure
Export step runs in under ~3 minutes	✅ Linux-only, no artifact upload, lightweight
export_presets.cfg changes are covered	✅ --export-release parses and validates export_presets.cfg

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Standards Compliance

• Action pinning: Uses actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 with comment hash — matches all other jobs in the file.
• Reuses existing tooling: Leverages .github/actions/load-godot-toolchain (consistent with release.yml and other test.yml jobs).
• Shell hardening: All bash steps use set -euo pipefail — consistent with existing workflow conventions.
• No artifact upload: Per issue spec, no artifacts are uploaded; just verifies build succeeds.
• Output verification: Checks both .x86_64 binary and .pck file exist with non-zero size — prevents silent failures.

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CI Check Results

All four CI jobs completed successfully on this PR:

• ✅ Headless smoke test
• ✅ Script test suite
• ✅ macOS validation
• ✅ Export validation (Linux) — the new job

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Evidence Provider Findings

No evidence providers configured; no findings to report.

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Tool Harness Findings

No issues. The tool harness confirmed:

• test.yml is well-formed with proper YAML structure
• The new export-validation job follows the same patterns as existing jobs
• release.yml export template installation logic is mirrored correctly

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Unknowns / Needs Verification

None. All acceptance criteria are verifiable from the diff and CI results.

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Conclusion

This is a minimal, well-scoped CI enhancement that directly addresses the regression risk identified in PR 233. It follows existing repository conventions, reuses shared tooling, and passes CI. No blockers.