feat(license): add Lite SKU; remove user-facing free trial

Two coupled changes:

1. Lite tier
   - New Tier.LITE in src/license/schema.py.
   - FEATURES_BY_TIER[Tier.LITE] = {Deduplicator, Text Cleaner,
     Format Standardizer}. The three universally-useful tools that
     cover the most common bookkeeping / RevOps / Klaviyo prep
     workflows. Other six tools require Core.
   - i18n: license.tier_lite, license.feature_locked_title,
     license.feature_locked_body, license.upgrade_link,
     license.status_locked (en + es).
   - Per-tool feature gate at every GUI tool page
     (require_feature_or_render_upgrade) and every tool CLI
     (guard(feature=...)). A locked tool renders an upgrade
     prompt + Manage-license button (GUI) or exits with code 2
     (CLI).
   - Home grid: tool cards the user's tier doesn't unlock get a
     red 🔒 Locked badge in place of green Ready.

2. Trial removed
   - Activation form's "Start 1-year trial" button removed.
   - license_cli's `trial` subcommand removed.
   - activation.trial_button / activation.trial_help i18n keys
     dropped (pack parity test stays green).
   - Tier.TRIAL stays in the enum (back-compat with any field-
     tested trial licenses); LicenseManager._mint stays internal
     for tests and the seller's key generator.
   - Decision logged in DECISIONS §9b: a 1-year all-features
     trial undercuts paid Lite; paid-only keeps tier economics
     clean.

Tests (+29 net): +17 Lite-tier unit/guard tests + 13 Lite-tier
GUI tests + 1 trial-absent assertion - 2 trial CLI tests - 1
trial GUI button test. Total: 1995 → 2024.

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

docs/DEVELOPER.md

@@ -165,8 +165,37 @@ explicitly use ``isolated_license_path`` /
 1. Add the enum value to ``Tier``.
 2. Add a row to ``FEATURES_BY_TIER`` listing the unlocked flags.
 3. Add ``license.tier_<name>`` translation keys to every i18n pack.
-4. The activation flow, sidebar status badge, and feature gate all
-   pick up the new tier automatically.
+4. The activation flow, sidebar status badge, feature gate, and home
+   grid lock badge all pick up the new tier automatically.
+
+**Worked example — the Lite tier**:
+
+```python
+# src/license/schema.py
+class Tier(str, Enum):
+    LITE = "lite"          # new
+    CORE = "core"
+    ...
+
+# src/license/features.py
+FEATURES_BY_TIER = {
+    ...
+    Tier.LITE: frozenset({
+        FeatureFlag.DEDUPLICATOR,
+        FeatureFlag.TEXT_CLEANER,
+        FeatureFlag.FORMAT_STANDARDIZER,
+    }),
+    Tier.CORE: _all(),
+    ...
+}
+```
+
+Then in en.json/es.json add ``license.tier_lite``. That's it — the
+existing ``require_feature_or_render_upgrade`` (GUI) and
+``guard(feature=...)`` (CLI) calls in every tool page/CLI route a
+Lite user into the upgrade prompt for any tool the tier doesn't
+unlock. The home grid's lock badge fires off the same feature
+lookup.
 
 **Minting a license** (creator-only):