3757 docs - Replace em dashes and fix embedded cross references

[ivicac]

Three docs commits from 0_732, replayed onto master, plus one follow-up.

Commits

• Replace em dashes with hyphens - a mechanical sweep across the docs tree.
• Mark the Plan limits cross reference coming soon.
• Point embedded failure notifications at the Notifications page - the Failures and Retries section listed the delivery channels itself ("email, Slack, or webhook"), which overstated what the released version offers: Notification.Type in v0.31.4 is EMAIL and WEBHOOK only, and the Notifications page already marks webhook as coming soon behind ff-1132. It now links to /platform/settings/notifications so the events and delivery types stay documented in the one place that maintains them. The same commit hides the unshipped automatic-retry-policy gap and records it in .agents/coming-soon-inventory.md.
• Replace em dashes on the embedded pages added since the sweep - the original sweep ran on the branch, so it could not reach five pages master added afterwards in 28a6deb. Same substitution, 49 occurrences over 42 lines. docs/content is now free of em dashes.

One thing to know

The em-dash sweep also touched docs/content/docs/platform/automation/settings/variables.mdx, which does not exist on master - it is a 0_732-only page for custom variables. That file was dropped from the port; its em-dash fix will come along when the page lands. All 163 other files applied cleanly.

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