feat: add law-study mode for law students (#1305)

Adds a new claude-mem mode tailored for law school study sessions, with
observation types for case holdings, issue patterns, prof frameworks,
doctrine/rule synthesis, argument structures, and cross-case connections.
Includes a chill variant and a CLAUDE.md template for use as a legal
study partner.

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

plugin/modes/law-study--chill.json

@@ -0,0 +1,7 @@
+{
+  "name": "Law Study (Chill)",
+  "prompts": {
+    "recording_focus": "WHAT TO RECORD (HIGH SIGNAL ONLY)\n----------------------------------\nOnly record what would be painful to reconstruct later:\n- Issue-spotting triggers: specific fact patterns that signal a testable issue\n- Professor's explicit emphasis, frameworks, or exam tips\n- Counterintuitive holdings or gotchas that contradict intuition\n- Cross-case connections that reframe how a doctrine works\n- A synthesized rule only if it distills something non-obvious from multiple sources\n\nSkip anything that could be looked up in a casebook in under 60 seconds.\n\nUse verbs like: held, established, revealed, distinguished, flagged",
+    "skip_guidance": "WHEN TO SKIP (LIBERAL — WHEN IN DOUBT, SKIP)\n---------------------------------------------\nSkip freely:\n- All case briefs, even condensed ones, unless the holding is counterintuitive\n- Any rule or doctrine stated plainly in the casebook without nuance\n- Definitions of standard legal terms\n- Procedural history\n- Any fact pattern or case that wasn't specifically emphasized by the professor\n- Anything you could find again in under 60 seconds\n- **No output necessary if skipping.**"
+  }
+}