chore(release): pin Claude Code to memhub v0.103.0

[sgonz-xtrace]

Moves the Claude Code catalog's pin from memhub--v0.87.0 (5ac4962) to memhub--v0.103.0 (18c85c3), the merge commit of #282.

• The tag was pushed before this PR, so ref resolves the moment this lands (git ls-remote shows 18c85c33… refs/tags/memhub--v0.103.0).
• plugins/memhub/.claude-plugin/plugin.json at 18c85c3 reads memhub 0.103.0.
• claude plugin validate . passes; version parity and test registration pass.

This is the Claude half of the 0.103.0 release. Codex and Cursor already got 0.103.0 when #282 merged, because their catalogs don't pin a version. Claude Code users keep getting 0.87.0 until this merges and they run /plugin marketplace update and restart.

🤖 Generated with Claude Code

[xtrace-memhub-staging]

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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×)
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• release helper · Sebastian Gonzalez