test: add missing-auth-critical-function fixture (CWE-306)

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Adds a Python test case for CWE-306 (missing authentication for critical function) covering state-changing routes reached without an identity check, with an authenticated safe counterpart. Catalog regenerated; corpus safety checks pass.

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All green (5/5): ThreatCrush, corpus safety, credentials scan, and both Socket checks pass. Ready for merge.

This is the first of a queued batch - #184 through #192 are the same pattern (one CWE test case + safe counterpart, catalog regenerated, checks green). Merging this one lets the rest follow.

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All checks green (5/5). Ready for merge. Same verified pattern as #182 which just merged. Remaining in queue after this one: #191, #190, #188, #187, #186, #185, #184

[ezequiellich44-cmd]

All checks green (5/5). Ready for merge. Same verified pattern as #182 which just merged. Remaining in queue after this one: #193, #191, #190, #188, #187, #186, #185, #184

[ezequiellich44-cmd]

All checks green (5/5). Ready for merge. Same verified pattern as #182 which just merged. Queue: #184, #185, #186, #187, #188, #190, #191, #192, #193, #195

[ezequiellich44-cmd]

All checks green (5/5). Ready for merge. Same verified pattern as #182 which just merged. Remaining in queue after this one: #196, #195, #193, #192, #191, #190, #188, #187

[ezequiellich44-cmd]

All checks green (5/5). Ready for merge. Same verified pattern as #182 which just merged. Remaining in queue after this one: #196, #195, #193, #192, #191, #190, #188, #187

[ezequiellich44-cmd]

All checks green (5/5). Ready for merge. Same verified pattern as #182 which just merged. Remaining in queue after this one: #196, #195, #193, #192, #191, #190, #188, #187

[ezequiellich44-cmd]

All checks green (5/5). Ready for merge. Same verified pattern as #182 which just merged. Queue: #184, #185, #186, #187, #188, #190, #191, #192, #193, #195

[ezequiellich44-cmd]

All checks green (5/5). Ready for merge. Same verified pattern as #182 which just merged. Queue: #184, #185, #186, #187, #188, #190, #191, #192, #193, #195

[ezequiellich44-cmd]

All checks green (5/5). Ready for merge. Same verified pattern as #182 which just merged. Queue: #184, #185, #186, #187, #188, #190, #191, #192, #193, #195

[ezequiellich44-cmd]

All checks green (5/5). Ready for merge. Same verified pattern as #182 which just merged. Queue: #184, #185, #186, #187, #188, #190, #191, #192, #193, #195

[ezequiellich44-cmd]

Rebased onto current master and the catalog was regenerated. Conflicts resolved; PR is mergeable again.