Drop unfinished session-hub experiment from main

[yourconscience]

#140 accidentally included two untracked WIP files (session_hub.go, session_hub_test.go) that reference a nonexistent Harness.Sessions field and break the root-module build. This removes them; the experiment continues out-of-tree until it compiles.

Summary by Sourcery

Bug Fixes:

• Remove unfinished session-hub files that broke the root-module build.

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Removes two accidentally committed WIP files for a 'session hub' experiment that referenced a nonexistent Harness.Sessions field and broke the root-module build, restoring a clean build state.

File-Level Changes

Change	Details	Files
Remove unfinished session-hub experiment code that breaks the root-module build.	Delete the session_hub.go implementation file that references a nonexistent Harness.Sessions field. Delete the session_hub_test.go test file associated with the unfinished session hub experiment.	cmd/dotagents/session_hub.go cmd/dotagents/session_hub_test.go

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