Promote overflow tasks and add side conversation

[Mattie]

Summary

• keep newly empty primary task buttons dark for five seconds, then promote the earliest M1 overflow task and compact the remaining overflow queue
• reserve the primary opening during the pause so a newer task cannot jump the queue
• fill primary holes and compact overflow assignments when saved state is restored
• add a side-conversation Joydex action mapped to Codex's validated openSideChat command
• update the documented Codex compatibility versions used to verify that command

Why

The overflow promotion and Side Conversation support were working-tree changes that were intentionally kept out of the wireless touchscreen PR. This PR preserves them as focused host changes after that PR was merged.

Validation

• Release tests: 390/390 passed (361 Joydex tests and 29 wireless-panel tests)
• focused task-pool tests: 20/20 passed
• git diff --check: passed
• NuGet vulnerability audit: no known vulnerable packages
• credential, private-network, personal-path, COM-port, and MAC-address scan: clean
• independent code review: no material blockers

Manual validation still pending

• publish the branch as the normal local Joydex runtime
• acknowledge a completed primary task with an occupied overflow slot
• confirm the primary button stays dark for roughly five seconds, then receives the earliest overflow task
• confirm Side Conversation still opens from the configured controls

Notes

Backfill reservations are intentionally transient: after a restart, restored state fills primary holes immediately and compacts the remaining overflow queue. openSideChat has no built-in fallback keystroke and therefore relies on the validated local Codex binding; unresolved bindings continue to fail closed through existing diagnostics.

The separate tools/Joydex.AgentActivity.Prototype work is excluded from this branch and PR.

[chatgpt-codex-connector]

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[Copilot]

Pull request overview

This PR enhances Joydex’s task-alert slot management by introducing delayed backfill promotion from overflow into newly vacated primary slots (with queue compaction), and adds a new “side conversation” action wired to Codex’s openSideChat command, along with updated Codex compatibility documentation.

Changes:

• Added a 5-second backfill delay that reserves vacated primary slots, then promotes the earliest overflow task and compacts the overflow queue.
• Ensured restored task-alert state fills primary holes immediately and compacts remaining overflow assignments.
• Added side-conversation / CodexAction.SideConversation mapped to the openSideChat Codex command, and updated compatibility versions/documentation.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/Joydex.Tests/TaskAlertPoolTests.cs	Adds coverage for delayed overflow promotion, reservation behavior, and restore compaction.
tests/Joydex.Tests/CodexActionExecutorTests.cs	Extends action-to-command mapping expectations to include SideConversation.
src/Joydex.Windows/TaskAlerts/TaskAlertCoordinator.cs	Passes an explicit acknowledgement timestamp into the pool for backfill scheduling.
src/Joydex.Windows/Actions/CodexCommandCatalog.cs	Adds openSideChat command descriptor for the new SideConversation action.
src/Joydex.Core/TaskAlerts/TaskAlertPool.cs	Implements backfill reservations, delayed promotion, and overflow compaction logic.
src/Joydex.Core/Mapping/CodexAction.cs	Adds SideConversation enum value and parses side-conversation binding ID.
src/Joydex.App/ButtonMapForm.cs	Adds UI label for the side-conversation action.
docs/LED_STATUS.md	Updates user-facing behavior documentation to reflect primary/overflow behavior and delayed promotion.
CHANGELOG.md	Records the new overflow promotion behavior.
AGENTS.md	Updates the documented Codex compatibility validation date and version/build identifiers.

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