test: align secondmate routing coverage with launch behavior

[ruby-dlee]

Intent

Find the actual reason Firstmate's Behavior CI has failed on every recent main push, determine whether it is the same failure as the earlier occupied-Herdr assertion and identify the commit where it changed, then restore a green baseline without weakening coverage. PR #43's 45-to-90-minute timeout increase is explicitly not the answer to main's seven-minute assertion failure. If a recent deliberate behavior change made the test stale, update the test to assert the intended behavior and explain the proof. Keep shared tracked work on a feature branch, open a PR, do not merge it, and state whether PR #43 remains needed.

What Changed

• Update secondmate routing fixtures to distinguish clean pre-routing homes from dirty homes and assert the intended enforce/off-mode behavior.
• Preserve freshness-gate coverage with dedicated dirty-home cases in both routing modes.
• Correct provisioning documentation to state that dirty, diverged, or unresolved secondmate homes are refused before launch.

Risk Assessment

✅ Low: The amended change preserves the corrected clean-home capability behavior and adds exactly two focused dirty incapable-home cases that verify freshness rejection precedes capability handling and endpoint creation in enforce and off modes.

Testing

Completed 1 recorded test check.

• Outcome: ⚠️ 1 error across 1 run (1h22m32s)

Pipeline

Updates from git push no-mistakes

✅ **intent** - passed

✅ No issues found.

✅ **Rebase** - passed

✅ No issues found.

🔧 **Review** - 1 issue found → auto-fixed ✅

• 🚨 tests/fm-account-routing.test.sh:2224 - The required criterion says “restore a green baseline without weakening coverage,” but these replacements convert both incapable-home cases into clean-fixture capability/compatibility checks and remove the previous assertions that dirty secondmate homes stop at the freshness gate. Preserve the new clean-home expectations, but add separate dirty incapable-home cases for enforce and off modes so freshness ordering remains covered.

🔧 Fix: Restore dirty secondmate freshness coverage
✅ Re-checked - no issues remain.

⚠️ **Test** - 1 error

• 🚨 tests failed with exit code 1
• command -v tmux >/dev/null || { echo "tmux is required for e2e tests" >&2; exit 1; }; tmux -V; rc=0; for t in tests/*.test.sh; do echo "== $t =="; bash "$t" || rc=1; done; uv run --directory tools/agent-fleet --locked pytest || rc=1; uv run --directory tools/agent-fleet --locked python -m compileall -q src || rc=1; exit "$rc"

✅ **Document** - passed

✅ No issues found.

✅ **Lint** - passed

✅ No issues found.

✅ **Push** - passed

✅ No issues found.