feat(Day 48): open testing tier — unlock all features for free users

Founder is sharing the platform link with lawyer-friends for feedback.
The Founding-50 monetization paywall (free tier only unlocks
search+lawyer_ask) blocks the very features they need to test.

Open `free` tier to include ALL features during this testing window:
- argument_analyze
- memo_generate
- opposing_counsel
- judge_analytics

Also bumped monthly_credits 30 → 500 + dropped the 10/day cap so
testers don't run out. Original config preserved as comments above —
revert after Founding 50 launch.

Paywall behavior preserved for non-free tiers (the `solo`/`pro`/`firm`
tier configs are unchanged). If revenue requires the paywall, restore
the commented-out original block.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tau_rag/middleware/entitlements.py

@@ -48,10 +48,23 @@ from typing import Dict, Optional
 # when credits are available.
 TIER_DEFS: Dict[str, dict] = {
     "free": {
-        "monthly_credits": 30,        # 30 credits/month — roughly 30 searches
-        "daily_credit_cap": 10,       # also a daily floor — friction signal
-        "unlocked_endpoints": {"search", "lawyer_ask"},
-        "price_he": "חינם",
+        # Day 48 — open testing mode. Friends-of-founder testing the
+        # platform need access to every feature so they can give real
+        # feedback. Originally `free` only unlocked search+lawyer_ask
+        # (Founding 50 monetization gate); now everything is open with
+        # a generous credit pool. Revert after Founding 50 launch by
+        # restoring the commented-out original below.
+        "monthly_credits": 500,       # was 30 — testers won't run out
+        "daily_credit_cap": None,     # was 10 — no daily friction during testing
+        "unlocked_endpoints": {"search", "lawyer_ask", "argument_analyze",
+                               "memo_generate", "opposing_counsel",
+                               "judge_analytics"},
+        "price_he": "חינם (תקופת בדיקה פתוחה)",
+        # ── Original (restore after launch) ──
+        # "monthly_credits": 30,
+        # "daily_credit_cap": 10,
+        # "unlocked_endpoints": {"search", "lawyer_ask"},
+        # "price_he": "חינם",
     },
     "solo": {
         "monthly_credits": 200,