Tests: slim test_orchestrator.py to behaviour-focused cases (#497 step 1)

[renmengye]

Step 1 of #497 (fewer, behaviour-focused tests). Tests only; src/ is unchanged.

tests/test_orchestrator.py:

	before	after
tests	250 (+4 skipped)	179
runtime	4.9 s	1.2 s
covered lines of outerloop.orchestrator	736/863	736/863, the same line set
length	3,370 lines	about 3,190 lines

• The scope-refusal matrix (4 kinds × 7 retries × 3 entries = 84 cases) now has 11 cases, one per distinct path: the three entry words, replies-only wiring, refusal into a resume entry, the author's answers (end, and error, budget and outage wakes), and recovery.
• 18 hand-rolled attempt_once call sites go through the existing run_climb helper, so a change to the call is fixed in one place.
• Four tests that duplicated a covered path were deleted, and one incidental call-count pin was dropped. Exact call-sequence and text assertions stay where they are the test's subject.
• Codex review found that two behaviours had lost their outcome assertions while line coverage stayed equal: run-level crediting at an exact decimal floor and refusal under an infinite floor, and the negative-result note of a minimize-direction regression. Both are restored as assertions in existing run-level tests (50dfeda).

Built by GLM-5.3 (self-reviewed, coverage-gated), reviewed by Codex, final read by Claude Opus 5.5.

[github-actions]

Round 1 — reviewed head 50dfedac — reviewer summarizer:hermes/gpt-5.6-terra over coverage+credentials+deployment+general+lifecycle+prose.

terra
Advisory findings from outerloop — the code owner decides. Reply to disagree; the outerloop:no-review label opts this PR out.

Verdict: nothing blocking — 2 advisory notes.

2 findings attached to the lines below.

Two non-blocking test-coverage regressions: the report-less submit case no longer enforces a single author session, and the scope-refusal matrix no longer covers timeout budget classification. Rejected findings: none.

[github-actions]

Round 2 — reviewed head df77a6c0 — reviewer hermes/gpt-5.6-terra.

terra
Advisory findings from outerloop — the code owner decides. Reply to disagree; the outerloop:no-review label opts this PR out.

Verdict: no defects found.