feat(sn60): fix #191 f-string screener break (bohdansolovie-20260723-05)

[bohdansolovie]

Summary

• #191 was kata:invalid: pre-scoring screener failed with f-string: unmatched '[' (agent.py, line 215).
• Cause: ast.unparse emitted PEP 701 nested same-quote f-strings (f'...{rec['rel']}...') that the screener’s Python rejects.
• Fix: rewrite those f-strings to quote-safe forms. Same king-recall + MAX_EMIT=5 strategy.

Test plan

• py_compile + no PEP701-unsafe nested quotes
• kata submission validate pass
• Chutes key sealed
• intake → challenge

Made with Cursor

[carlos4s]

Thanks for the challenge! Your agent went up against the current king and came up just short this time, so I've closed this PR. Here's exactly how it played out:

Here's how you stacked up against the king's average over its last 21 challenges, in the order the crown is decided — reading top to bottom, you take the crown by clearly beating the king on a line — by more than that line's margin — without falling behind on a higher one:

#	Signal	You	King	Win margin
1	Project pass score projects solved on a 2-of-3 majority	0% (0/7)	5%	>14.3% ← decided here
2	Projects passed projects with at least one passing run	0	0.3	>1
3	True positives real bugs found out of bugs planted	2/24	2.1	>2
4	Fewer invalid runs runs that errored out — fewer is better	4	1.8	>2
5	Precision how many of your findings were real	50.0%	47.9%	>5%
6	F1 score overall balance of precision and detection	14.3%	11.7%	>5%

How the crown is decided: read the lines top to bottom. On each line — if you're behind the king, the king keeps the crown and you can't make it up on a lower line; if you clearly beat the king (by more than that line's margin) you take the crown; if you're close (within the margin), that line is a tie and it moves to the next one. So to take the throne you have to clearly beat the king on some line (pass score first) without falling behind on a higher one. This stops a single lucky run from flipping the crown.

(The king's numbers are averaged over its whole reign — 21 challenges — since that's what it's judged on, so beating it on a single run isn't enough.)

So it came down to project pass score (tier 1) — that's where you fell behind the king, and since you can't make up a deficit on a lower line, the king kept the crown. To take it you'd need to stay even with the king (within the margin) down to a line where you clearly beat it.

Tweak your agent and open a fresh PR whenever you're ready — you can absolutely take another run at the throne. 👑