ci(mythos-auto): register provenance.rs as Tier-5

[avrabe]

Summary

Adds `meld-core/src/provenance.rs` to the Tier-5 pattern list in `mythos-auto.yml`. v0.14.0's component-provenance section emitter shipped but wasn't in the Mythos auto-scan registry; future changes to the section format / origin-tuple plumbing / fused_func_idx arithmetic now get the AI-driven delta-pass scan on PR.

Split from #196 (LS-R-11 layer-2) because `anthropics/claude-code-action` requires this workflow file to be byte-identical to main for PR runs — a workflow self-reference breaks the action's auth flow. This PR touches no Tier-5 source, so its own Mythos scan is a no-op and the identity check passes once merged.

Test plan

• One-line additive change to the pattern array; YAML still valid
• CI green (no Rust changes, so Test/Clippy are trivial)

🤖 Generated with Claude Code

[github-actions]

LS-N verification gate

⚠️ 35/37 verified — 2 missing regression tests

	count
Passed (≥1 test, all green)	35
Failed (≥1 test failure)	0
Missing (no ls_*_NN_* test found)	2

_{Approved loss-scenarios.yaml entries are expected to have a
regression test named ls_<letter>_<num>_* (e.g. LS-A-11 →
ls_a_11_*). The gate runs each prefix via cargo test --lib --no-fail-fast and aggregates pass/fail/missing.}

Failed LS entries

(none)

Missing regression tests

• LS-R-13
• LS-M-6

_{Updated automatically by tools/post_verification_comment.py.
Source of truth: safety/stpa/loss-scenarios.yaml.}