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Phase 1 of the Scalable Approach for Adding New IDE Session Types RFC, tracked in #27410. Gives agent session accounting one canonical vocabulary for app names, so later work can report a count per app without the agent and the server disagreeing about what an app is called. - Adds codersdk/appname.go: NormalizeAppName for storage and lookup, and AppFamilyName for the places that need a bounded value, such as a Prometheus label or the Connection_Type enum. - agentssh.Server keeps session counters in a map keyed by normalized name instead of three fixed atomics, dropping entries at zero. - Drops MagicSessionType. Sessions carry plain app names, and unrecognized ones flow through as themselves rather than collapsing to unknown. Wire behavior is unchanged: the agent still reports the four session_count_* fields over Agent API 2.10.