fix(claude-code): skip duplicate recall banks

[koriyoshi2041]

Summary

• skip recallAdditionalBanks entries that repeat the primary Claude Code memory bank
• de-duplicate repeated additional bank IDs while preserving order
• add a regression test for primary-bank and repeated extra-bank entries

Closes #2604

Test

• uv run pytest hindsight-integrations/claude-code/tests/test_hooks.py::TestRecallHook::test_additional_banks_skip_primary_and_duplicates -q
• uv run pytest hindsight-integrations/claude-code/tests/test_hooks.py -q
• uv run ruff format --check hindsight-integrations/claude-code/scripts/recall.py hindsight-integrations/claude-code/tests/test_hooks.py
• uv run ruff check hindsight-integrations/claude-code/scripts/recall.py hindsight-integrations/claude-code/tests/test_hooks.py
• git diff --check

[koriyoshi2041]

Closing this in favor of #2625, which covers the same recallAdditionalBanks duplicate/primary-bank case and is already green. Thanks for picking it up.