fix(ci): Phase-2 fleet submission must not fail the security gate

[hyperpolymath]

Layer-1 propagation of hyperpolymath/hypatia#252.

This repo carries its own copy of .github/workflows/hypatia-scan.yml.
The "Submit findings to gitbot-fleet (Phase 2)" step hard-failed the
job (exit 127) for any commit with ≥1 finding — it clones gitbot-fleet
and execs scripts/submit-finding.sh, which no longer exists on
gitbot-fleet's default branch. That is the estate-wide "Hypatia
Neurosymbolic Analysis fails regardless of content" symptom.

Phase 2 is the collaborative learning side-channel, not the security
gate (the gate is the separate baseline-aware critical/high step, which
is untouched). Fix mirrors the canonical workflow:

• continue-on-error: true on the Phase-2 step.
• Self-healing body: non-fatal clone, probe known submit-script paths,
  skip with ::warning:: if absent or non-zero.

Surgical: only the Phase-2 step changed; every other step preserved.
Security enforcement is unchanged.

Refs hyperpolymath/hypatia#252

🤖 Generated with Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 3 issues detected

Severity	Count
🔴 Critical	1
🟠 High	0
🟡 Medium	2

⚠️ Action Required: Critical security issues found!

View findings

[
  {
    "line": 24,
    "reason": "Secret found: Generic API key",
    "type": "secret_detected",
    "file": "/home/runner/work/TradeUnionist.jl/TradeUnionist.jl/.envrc",
    "action": "revoke_rotate_and_purge",
    "rule_module": "security_errors",
    "severity": "critical"
  },
  {
    "reason": "Repository has 1 non-main remote branch(es). Policy: single main branch only.",
    "type": "GS007",
    "file": ".",
    "action": "delete_remote_branches",
    "rule_module": "git_state",
    "severity": "medium"
  },
  {
    "reason": "Source file missing SPDX-License-Identifier header",
    "type": "SD009",
    "file": "ffi/zig/src/main.zig",
    "action": "add_spdx_header",
    "rule_module": "structural_drift",
    "severity": "medium"
  }
]

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