sync Claude Code command with v4 features

[emanmunir]

Summary

v4.0.0 updated commands/remember.md (Cowork) with silent mode, user observations, dashboard template, and user.md flush, but .claude/commands/remember.md (Claude Code) was never brought along. This PR syncs the Claude Code slash command to the same behavior, using direct filesystem access only (no Cowork MCP).

Changes

• .claude/commands/remember.md — parity with commands/remember.md: Mode Detection (full vs silent), Section D (user observations), DASHBOARD.md template, User Node observation flush (dedup / contradictions / confidence gating), Step 5 full + silent confirmation lists, and the richer knowledge examples in Step 2B; storage steps adapted for Claude Code (~/Documents/Claude/memory/ + Windows %USERPROFILE% note).
• CHANGELOG.md — ## [Unreleased] → Fixed entry for the above.

Checklist

• Command files updated (if behavior changed)
• Matching skill files updated (command ↔ skill parity)
• plugin.json version bumped (if user-visible change)
• README updated (command table, setup, or description)
• CHANGELOG.md entry added under [Unreleased]
• Frontmatter (description) is accurate on new/changed files
• Cowork commands/ and Claude Code .claude/commands/ stay consistent (if both exist)

Test plan

• Ran python scripts/check_repo.py — OK (plugin.json + frontmatter on all command/skill markdown).