rename .story_kit directory to .storkit and update all references

Renames the config directory and updates 514 references across 42 Rust
source files, plus CLAUDE.md, .gitignore, Makefile, script/release,
and .mcp.json files. All 1205 tests pass.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.storkit/bot.toml.example

@@ -0,0 +1,61 @@
+homeserver = "https://matrix.example.com"
+username = "@botname:example.com"
+password = "your-bot-password"
+
+# List one or more rooms to listen in.  Use a single-element list for one room.
+room_ids = ["!roomid:example.com"]
+
+# Optional: the deprecated single-room key is still accepted for backwards compat.
+# room_id = "!roomid:example.com"
+
+allowed_users = ["@youruser:example.com"]
+enabled = false
+
+# Maximum conversation turns to remember per room (default: 20).
+# history_size = 20
+
+# Rooms where the bot responds to all messages (not just addressed ones).
+# This list is updated automatically when users toggle ambient mode at runtime.
+# ambient_rooms = ["!roomid:example.com"]
+
+# ── WhatsApp Business API ──────────────────────────────────────────────
+# Set transport = "whatsapp" to use WhatsApp instead of Matrix.
+# The webhook endpoint will be available at /webhook/whatsapp.
+# You must configure this URL in the Meta Developer Dashboard.
+#
+# transport = "whatsapp"
+# whatsapp_phone_number_id = "123456789012345"
+# whatsapp_access_token = "EAAx..."
+# whatsapp_verify_token = "my-secret-verify-token"
+#
+# ── 24-hour messaging window & notification templates ─────────────────
+# WhatsApp only allows free-form text messages within 24 hours of the last
+# inbound message from a user.  For proactive pipeline notifications sent
+# after the window expires, an approved Meta message template is used.
+#
+# Register the template in the Meta Business Manager:
+#   1. Go to Business Settings → WhatsApp → Message Templates → Create.
+#   2. Category: UTILITY
+#   3. Template name: pipeline_notification   (or your chosen name below)
+#   4. Language: English (en_US)
+#   5. Body text (example):
+#        Story *{{1}}* has moved to *{{2}}*.
+#      Where {{1}} = story name, {{2}} = pipeline stage.
+#   6. Submit for review.  Meta typically approves utility templates within
+#      minutes; transactional categories may take longer.
+#
+# Once approved, set the name below (default: "pipeline_notification"):
+# whatsapp_notification_template = "pipeline_notification"
+
+# ── Slack Bot API ─────────────────────────────────────────────────────
+# Set transport = "slack" to use Slack instead of Matrix.
+# The webhook endpoint will be available at /webhook/slack.
+# Configure this URL in the Slack App → Event Subscriptions → Request URL.
+#
+# Required Slack App scopes: chat:write, chat:update
+# Subscribe to bot events: message.channels, message.groups, message.im
+#
+# transport = "slack"
+# slack_bot_token = "xoxb-..."
+# slack_signing_secret = "your-signing-secret"
+# slack_channel_ids = ["C01ABCDEF"]