fix: detect codex model capacity errors as blocked - #2342

#!/bin/bash
set -eu
printf '%s\n' '--- manifest ---'
cat -n src/detect/manifests/codex.toml
printf '%s\n' '--- relevant tests ---'
sed -n '700,780p' src/detect/manifest/tests.rs
printf '%s\n' '--- related rules and helpers ---'
rg -n -C 3 'bottom_non_empty_lines|capacity|codex' src/detect
printf '%s\n' '--- repository changes ---'
git diff --stat
git status --short
printf '%s\n' '--- validation recipes ---'
if command -v just >/dev/null 2>&1; then just --list 2>/dev/null | sed -n '1,120p'; else echo 'just unavailable'; fi

#!/bin/bash
set -eu
printf '%s\n' '--- capacity tests ---'
sed -n '760,790p' src/detect/manifest/tests.rs
printf '%s\n' '--- region implementation ---'
sed -n '1240,1345p' src/detect/manifest.rs
printf '%s\n' '--- region tests ---'
sed -n '520,550p' src/detect/manifest/tests.rs
printf '%s\n' '--- project requirement references ---'
rg -n -i -C 3 'bottom three|three-line|three lines|capacity error|model capacity|at capacity|codex' \
  README.md .github src tests 2>/dev/null | sed -n '1,240p'
printf '%s\n' '--- just recipe definition ---'
if [ -f justfile ]; then rg -n -C 3 '^check|check:' justfile; else echo 'justfile not found'; fi

#!/bin/bash
set -eu
python3 - <<'PY'
import re

screen = (
    "⚠ Selected model is at capacity. Please\n"
    "  try a different model.\n\n"
    "› Summarize recent commits\n\n"
    "gpt-5.6-sol high · /work · Ready\n"
)
pattern = re.compile(
    r"(?m)^⚠ Selected\s+model\s+is\s+at\s+capacity\.\s+Please\s+"
    r"a\s+different\s+model\.$"
)

def bottom_non_empty_lines(content, count):
    lines = content.splitlines()
    selected = [i for i, line in reversed(list(enumerate(lines)))
                if line.strip()][:count]
    return "" if not selected else "\n".join(lines[min(selected)]) + "\n" if False else \
        "\n".join(lines[min(selected):]) + "\n"

for count in (3, 4):
    region = bottom_non_empty_lines(screen, count)
    print(f"count={count}")
    print("region_lines=", repr(region.splitlines()))
    print("capacity_match=", bool(pattern.search(region)))
PY
printf '%s\n' '--- exact manifest diff ---'
git diff -- src/detect/manifests/codex.toml src/detect/manifest/tests.rs

#!/bin/bash
set -eu
python3 - <<'PY'
import re

screen = (
    "⚠ Selected model is at capacity. Please\n"
    "  try a different model.\n\n"
    "› Summarize recent commits\n\n"
    "gpt-5.6-sol high · /work · Ready\n"
)
pattern = re.compile(
    r"(?m)^⚠ Selected\s+model\s+is\s+at\s+capacity\.\s+"
    r"Please\s+try\s+a\s+different\s+model\.$"
)

def bottom_non_empty_lines(content, count):
    lines = content.splitlines()
    indices = [i for i, line in reversed(list(enumerate(lines)))
               if line.strip()][:count]
    return "" if not indices else "\n".join(lines[min(indices):]) + "\n"

for count in (3, 4):
    region = bottom_non_empty_lines(screen, count)
    print(f"count={count}")
    print("region_lines=", repr(region.splitlines()))
    print("capacity_match=", bool(pattern.search(region)))

stale = (
    "⚠ Selected model is at capacity. Please try a different model.\n\n"
    "• Explored\n"
    "└ Read Cargo.toml\n\n"
    "› Summarize recent commits\n\n"
    "gpt-5.6-sol high · /work · Ready\n"
)
for count in (3, 4):
    region = bottom_non_empty_lines(stale, count)
    print(f"stale_count={count}", "capacity_match=", bool(pattern.search(region)))
PY