fix: export PATH in hooks so node resolves on nvm systems

[frank-ih]

Closes thedotmack#1598

🔴 Failing scenario (the bug)

On any system where Node is installed via nvm (not in a system path), every claude-mem hook fails silently:

Ran a hook on session startup
/bin/sh: node: command not found

Ran a hook on session startup
/bin/sh: node: command not found

Ran a hook on session compact
/bin/sh: node: command not found

Why: Claude Code executes hooks via /bin/sh, which launches a minimal non-interactive shell. It does not source .bashrc/.zshrc and does not inherit the user's $PATH. When nvm is used, node lives at ~/.nvm/versions/node/<version>/bin/ — a path that /bin/sh knows nothing about.

🟢 Expected behavior (after this fix)

All hooks resolve node correctly regardless of whether it was installed via nvm, Homebrew (/opt/homebrew/bin), or a system package (/usr/local/bin). No errors on session startup, compact, or stop.

✅ The fix

Each hook command now opens with a dynamic export PATH that:

1. Detects whether ~/.nvm/versions/node exists
2. If yes, resolves the latest installed version via sort -V | tail -1 and prepends its bin/ to PATH
3. Also prepends /opt/homebrew/bin and /usr/local/bin for Homebrew and system installs
4. Falls back cleanly on systems where node is already on PATH (no-op)

export PATH="$([ -d "$HOME/.nvm/versions/node" ] && echo "$HOME/.nvm/versions/node/$(ls "$HOME/.nvm/versions/node" | sort -V | tail -1)/bin:" || true)/usr/local/bin:/opt/homebrew/bin:/usr/bin:/bin:$PATH"

This pattern was already present in the cached version of hooks.json generated post-install, but was missing from the marketplace version that Claude Code actually reads at runtime.

🔁 Files changed

• plugin/hooks/hooks.json — added export PATH prefix to all 6 hook commands (SessionStart ×3, UserPromptSubmit, PostToolUse, Stop, SessionEnd)