v0.7.0

Features

• Slack notifications: styre can now post to Slack for escalations, terminal states, and (at higher verbosity) stage transitions, so you can follow ticket progress without watching the CLI directly.
• Slack messages include the ticket title and a "View PR" button linking to the pull request, formatted with Slack's rich Block Kit layout.
• Dead-end blocked terminals now trigger a Slack notification distinct from escalation-blocked cases, so you get exactly one message per outcome instead of none or duplicates.
• Added a styre notify --test command to send a test Slack message and confirm your bot token and channel configuration are working.
• Set SLACK_BOT_TOKEN and configure your notification policy and channel in config.json to turn this on; styre fails loudly at startup if the configuration is incomplete.

Bug Fixes

• Slack delivery failures are now surfaced with clearer diagnostic messages instead of failing silently, and they never cause a ticket to be escalated on their own.