ci: pin just@1.34.0 in build-gossamer-gui — Tooling Version Integrity (cf. burble#39)

[hyperpolymath]

What

build-gossamer-gui.yml installed tool: just unversioned via taiki-e/install-action. That action's bundled manifest can ship an old just (e.g. 1.14.0). hypatia/Justfile:10 uses import? "contractile.just" — an optional-import feature requiring just ≥ 1.19.0. An old just dies at parse time (error: Unknown start of token) before any recipe runs, silently breaking the build.

This is the exact root cause of the long-misdiagnosed dead Elixir test gate in burble#39 (fixed there by pinning just@1.34.0), here found armed in another repo by an estate-wide sweep.

Fix

Pin tool: just@1.34.0 (≥ 1.19.0, supports import?) with an explanatory comment referencing the estate Tooling Version Integrity policy.

Context

P0 of a full rollout institutionalising this lesson (policy doc in standards, must check, lint rule, canonical-template propagation). Immediate stop-the-bleeding fix for the only live armed instance found.

🤖 Generated with Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 13 issues detected

Severity	Count
🔴 Critical	2
🟠 High	3
🟡 Medium	8

⚠️ Action Required: Critical security issues found!

View findings

[
  {
    "reason": "Issue in quality.yml",
    "type": "missing_workflow",
    "file": "quality.yml",
    "action": "create",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Issue in mirror.yml",
    "type": "missing_workflow",
    "file": "mirror.yml",
    "action": "create",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Issue in security-policy.yml",
    "type": "missing_workflow",
    "file": "security-policy.yml",
    "action": "create",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Action hyperpolymath/standards/.github/workflows/governance-reusable.yml@main needs attention",
    "type": "unpinned_action",
    "file": "governance.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "believe_me undermines formal verification (2 occurrences, CWE-704)",
    "type": "believe_me",
    "file": "/home/runner/work/hypatia/hypatia/src/abi/RuleEngine.idr",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "critical"
  },
  {
    "reason": "Nickel file missing SPDX-License-Identifier header (1 occurrences, CWE-1104)",
    "type": "ncl_missing_spdx",
    "file": "/home/runner/work/hypatia/hypatia/configs/config.ncl",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "medium"
  },
  {
    "reason": "unsafe block -- requires SAFETY comment (22 occurrences, CWE-676)",
    "type": "unsafe_block",
    "file": "/home/runner/work/hypatia/hypatia/clients/rust/hypatia-client/src/ffi.rs",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "medium"
  },
  {
    "reason": "as_ptr exposes raw pointer that may dangle or alias unsafely (10 occurrences, CWE-676)",
    "type": "as_ptr",
    "file": "/home/runner/work/hypatia/hypatia/clients/rust/hypatia-client/src/ffi.rs",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "medium"
  },
  {
    "reason": "expect() in hot path (1 occurrences, CWE-754)",
    "type": "expect_in_hot_path",
    "file": "/home/runner/work/hypatia/hypatia/adapters/src/codeberg.rs",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "medium"
  },
  {
    "reason": "expect() in hot path (1 occurrences, CWE-754)",
    "type": "expect_in_hot_path",
    "file": "/home/runner/work/hypatia/hypatia/adapters/src/radicle.rs",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "medium"
  }
]

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[hyperpolymath]

Subsumed by #279 (merged 2026-05-19). The one-line just@1.34.0 pin in build-gossamer-gui.yml that this PR introduced was folded verbatim into #279's branch (commit ac01499) so the Python-eradication change could satisfy the Security policy R1 check. The pin is now on main via #279. Closing as completed-by-other. cf. burble#39.

[hyperpolymath]

Superseding (no re-open).

Verified 2026-05-19: the exact fix proposed here — pin tool: just@1.34.0 in .github/workflows/build-gossamer-gui.yml with the import?-floor rationale — is already present on origin/main at line 148, with the same rationale comment block this PR proposed. It landed via a separate commit rather than this PR.

Forward enforcement is provided by the R0 just-floor blocking gate added to governance-reusable.yml in hyperpolymath/standards#94 (tracked at hyperpolymath/standards#95), which fails CI on any unversioned/under-floor just install. Any regression would be caught at the gate, not silently parse-fail at runtime.

Closure outcome: superseded. No re-open needed. Closes the corresponding criterion on hyperpolymath/standards#95.

Refs hyperpolymath/standards#95, hyperpolymath/standards#94, burble#39.