frozen_issue_codes falsely reports a live multiline Python Issue call as removed

[alpCaner]

Found while reviewing

PR #352 at 1cab240df85d5896c5390697c069720ff2bb24d3 fails cargo test --locked --workspace on every native OS:

RESERVED ISSUE CODE `sdk.network-required` is gone:
python/tan/commands/sdk_cmd.py no longer contains
"Issue(\"sdk.network-required\", \"warning\", ...)" outside comments.

The emission is not gone. It is now a normal multiline Python call:

Issue(
    "sdk.network-required",
    "warning",
    ...
)

The source scanner keys on one formatting shape rather than Python syntax, so a line wrap turns a live registered code into a stale-code verdict.

Impact

• Linux, Windows and macOS contract jobs all fail for a false reason.
• Formatting becomes part of the wire-contract gate.
• The tempting workaround—rewrapping production code to satisfy substring scanning—leaves the scanner unable to recognize other valid call shapes.

Acceptance criteria

• Parse Python issue emissions structurally (AST or the existing emitted-code scanner), including multiline calls and named arguments.
• Keep ignoring comments/docstrings and dynamically assembled codes according to the registry policy.
• Add a regression fixture for this exact multiline Issue call.
• cargo test --locked --workspace passes without changing the emission or removing the registry entry.

Related: #219, #224, PR #352.

[alpCaner]

Fixed on dev in ac79d4c (PR #352). dev IS this repo's default branch, so Closes does fire here -- but this issue was filed AFTER the PR body's closing-keyword list was written, so it was never in it. Closed by hand; a merged PR body cannot close retroactively.

The Rust gate delegates python-side entries to the Python gate, which parses structurally; the delegation is asserted from both ends. sdk_cmd.py is untouched -- rewrapping production code to satisfy a scanner was the workaround this issue rejected. test (ubuntu/windows/macos-latest) are green on the merge commit.

See #372 for what verifying this fix found: the delegation pin proves the delegate EXISTS, not that it RUNS.