fix(ci): make hunt regeneration actually regenerate

[triw0lf]

Problem

Hunt regeneration has never worked. Found while testing the regeneration path after the Sonnet 5 migration.

.github/workflows/issue-generate-hunts.yml:107:

HUNT_FILE=$(ls Flames/H-*.md | head -n 1)

Hunt files are named H259.md — not H-259.md. The glob has never matched:

ls: cannot access 'Flames/H-*.md': No such file or directory

ls fails → EXISTING_HUNT_FILE is empty → is_regeneration is False → generate_from_cti.py logs 🌱 Generating new hunt: H260 and writes an additional hunt file instead of updating the existing one.

Observed on a live test run

Issue #369, regeneration run 30830538400. The draft branch ended up with both H259.md and H260.md.

Effects

Regeneration doesn't regenerate	A new hunt file is added per attempt
Orphan hunts accumulate	Draft branches hold every attempt
Hunt IDs consumed	Each attempt burns a number
Regeneration prompt never runs	The is_regeneration branch in generate_from_cti.py is unreachable
Attempts still counted	Users burn 1 of 5 for a no-op

Broken since 5a0b4bc (2025-06-21), the commit that added the regeneration loop.

Fix

Select the hunt file added on the draft branch rather than globbing the working tree:

HUNT_FILE=$(git diff --name-only origin/main...HEAD -- 'Flames/H*.md' | head -n 1)

Note the naive fix is worse than the bug. Changing the glob to Flames/H*.md matches every hunt already on main — verified, it returns Flames/H001.md, so regeneration would silently overwrite a production hunt.

Also fails loudly when no draft file is found, instead of silently degrading to a new generation.

Verified

Against the real draft/issue-369:

$ git diff --name-only origin/main...origin/draft/issue-369 -- 'Flames/H*.md' | head -n 1
Flames/H259.md      # correct — the original draft

Testing note

on: issues workflows always run the copy on the default branch, so this fix can't be exercised from a PR branch. It needs to land on main before regeneration can be verified end to end.

🤖 Generated with Claude Code