test: bring public's suites up to the v0.103.0 plugin

[sgonz-xtrace]

Companion to #282, the same pattern as #279 for v0.87.0.

A promotion replaces plugins/memhub/ only, so public's tests/ and its codex-hooks generator stayed at 0.88.0 while the plugin moved to 0.103.0. Nineteen suites failed guard and probe-tests on #282 (and Production plugin readiness rolls up probe-tests), each on an intentional internal change: directive recall retired (#80), capture never routed to a brain (#79), the rule judge and state sweep (#96, #87), and the one-line harness hand-off (#90, #97).

What changes — 21 files, all under tests/ and scripts/; nothing under plugins/:

• 18 suites replaced with internal's at ca51713 (the promoted commit), plugins/memhub-staging rewritten to plugins/memhub.
• scripts/gen_codex_hooks.py ported the same way — it still required the removed directive_recall.py hook.
• directive_recall_test.py removed from tests/ and scripts/, as on internal.

Verified locally on this branch (the promoted plugin): run_all 72/72 on Python 3.12 with mcp<2 (and 3.14), check-plugin.sh ALL PASS, version parity and test registration pass.

Merges into promote/memhub-v0.103.0; #282's head then needs a fresh real-agent-evidence run.

🤖 Generated with Claude Code

[xtrace-memhub-staging]

🧠 Session context

1 session behind this pull request.

Team rules that fired while building this

• Keep rule authoring on the live agent (suppressed, 2×)
• Plugin fixes can't rely on user settings edits (suppressed, 2×)
• PR title carries its Linear ticket (ENG-n) (gate, 2×)
• Run real-agent evidence on the PR head (advise, 2×)
• A green hook unit suite is not a green harness (suppressed, 1×)
• A loop tick says what it is for (advise, 1×)
• …more

Effort
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Sessions

• release helper · Sebastian Gonzalez