[joelmoss]

Part of #154 (remote agent sessions).

When a host connection is lost or replaced, pending repository calls now fail immediately and late responses are discarded. Readers and writers retain the connection generation that created them; reconnecting never replays a write or silently moves an existing service to a different connection.

Adds an app-wide HostConnectionManager, an injectable negotiated-service interface, and generation-bound remote repository adapters. Cancelled or superseded handshakes close late connections. Per-host snapshots let subscribers detect reconnects and refresh services; disconnects during status reads remain explicit unavailable results. Local VCS engines and terminal relays keep their existing paths.

This is the second layer of the remote-workrooms stack, based on #201 (feat/host-aware-repository-routing). Keep both PRs draft and unmerged until the upcoming stable release is cut. The next layer supplies agent-backed VCS reads. Live transport, production remote connections, window subscription integration, provisioning, and remote UI remain later work.

Validation:

• Generation, formatting, app build, and strict lint passed.
• Full app unit/integration suite: 2,730 passed, 1 skipped, 0 failed. Includes 11 new lifecycle/routing regressions for host isolation, multiple routers, cancellation, late handshakes/results, non-replayed writes, context validation, and status failures.
• One intermediate full run hit SessionShimCompatibilityTests.testTheShippedDaemonRefusesAFutureProtocolVersion with a socket connection refusal before its assertion; the final full rerun passed. No shim changes were made.
• Independent adversarial review completed with no remaining findings after cancellation dispatch and caller error-mapping fixes.
• UI tests were not run; this change adds no UI.

Summary by CodeRabbit

• New Features

  • Improved remote workroom connection handling across hosts.
  • Reconnecting now refreshes services, state, and subscriptions to prevent stale results.
  • Multiple hosts using the same path remain isolated.
  • Remote repository actions now report connection, cancellation, and context errors more clearly.
  • Failed or interrupted writes are not automatically replayed.

• Bug Fixes

  • Host connection failures are now correctly shown as unavailable instead of being classified as invalid repositories.

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Review configuration:

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 367d4b61-f06c-473b-a85b-d47cbea35bfa

📥 Commits

Reviewing files that changed from the base of the PR and between 459d88c and 6ffda9a.

📒 Files selected for processing (6)

• docs/designs/remote-workrooms.md
• macapp/WorkroomApp/Core/HostConnectionManager.swift
• macapp/WorkroomApp/Core/HostRepositoryServices.swift
• macapp/WorkroomApp/Core/RepositoryLocation.swift
• macapp/WorkroomApp/Core/WorkroomStatusResolver.swift
• macapp/WorkroomAppTests/HostConnectionManagerTests.swift

📝 Walkthrough

Walkthrough

Changes

Host connection lifecycle

Layer / File(s)	Summary
Connection contract and host state macapp/WorkroomApp/Core/HostConnectionManager.swift	Defines HostServiceConnection, connection errors, per-host state, leases, and generation-aware snapshot subscriptions.
Connection lifecycle and lease operations macapp/WorkroomApp/Core/HostConnectionManager.swift	Establishes connections, replaces generations, rejects stale responses, handles disconnects, cancels pending work, and invalidates hosts without retrying writes.
Repository services, routing, and validation macapp/WorkroomApp/Core/HostRepositoryServices.swift, macapp/WorkroomApp/Core/RepositoryLocation.swift, macapp/WorkroomApp/Core/WorkroomStatusResolver.swift, macapp/WorkroomAppTests/HostConnectionManagerTests.swift, docs/designs/remote-workrooms.md	Routes non-local repositories through shared host connections, maps connection failures to unavailable status, and tests cancellation, isolation, reconnect handling, stale leases, and non-replayed writes. The design document records the implemented lifecycle and its scope.

Priority: ➖ Normal

Estimated code review effort: 4 (Complex) | ~45 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant RepositoryRouter
  participant HostConnectionManager
  participant HostRepositoryReader
  participant HostRepositoryWriter
  participant HostServiceConnection
  RepositoryRouter->>HostConnectionManager: request reader or writer
  HostConnectionManager->>HostServiceConnection: use current host lease
  HostConnectionManager-->>RepositoryRouter: return lease-bound service
  RepositoryRouter->>HostRepositoryReader: perform read
  RepositoryRouter->>HostRepositoryWriter: perform write or commit
  HostRepositoryReader->>HostConnectionManager: execute lease-bound operation
  HostRepositoryWriter->>HostConnectionManager: execute lease-bound operation
  HostServiceConnection-->>HostConnectionManager: report transport loss
  HostConnectionManager-->>HostRepositoryReader: fail current operation
  HostConnectionManager-->>HostRepositoryWriter: fail current operation

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Merge Risk: 🔵 Low · up to bd4f0

Mergeable after regenerating the Xcode project so the new source and test files are included correctly.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 4.05% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 74 functions across 5 files. (1 skipped: 1…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: managing host service connection lifecycles in the macOS app.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

Docstring coverage is 4.05% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 74 functions across 5 files. (1 skipped: 1 unsupported.)

✨ Finishing Touches 💡 1

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Inline comments:
In `@macapp/WorkroomApp/Core/HostConnectionManager.swift`:
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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 93440783-d3a8-41e3-806a-4d12488fcad0

📥 Commits

Reviewing files that changed from the base of the PR and between 2ea1ad7 and bd4f0db.

📒 Files selected for processing (6)

• docs/designs/remote-workrooms.md
• macapp/WorkroomApp/Core/HostConnectionManager.swift
• macapp/WorkroomApp/Core/HostRepositoryServices.swift
• macapp/WorkroomApp/Core/RepositoryLocation.swift
• macapp/WorkroomApp/Core/WorkroomStatusResolver.swift
• macapp/WorkroomAppTests/HostConnectionManagerTests.swift

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Confidence Score: 5/5

The connection-lifecycle foundation appears safe to merge, with no actionable correctness or quality issues identified.

Summary

This PR adds generation-bound host service connection management and integrates it with remote repository routing.

• Fails pending repository calls when a connection is lost or replaced.
• Discards late results and closes superseded or cancelled handshake connections.
• Keeps readers and writers bound to the connection generation that created them.
• Publishes per-host snapshots so future consumers can refresh after reconnects.
• Maps connection failures during status resolution to explicit unavailable results.
• Adds lifecycle, cancellation, host-isolation, and non-replay regression coverage.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart TD
  Router[RepositoryRouter] -->|remote repository context| Manager[HostConnectionManager]
  Manager --> Slot[Per-host connection slot]
  Slot --> Lease[Generation lease]
  Manager --> Reader[HostRepositoryReader]
  Manager --> Writer[HostRepositoryWriter]
  Reader -->|perform on lease| Service[Negotiated host service]
  Writer -->|perform on lease| Service
  Loss[Disconnect or replacement] --> Invalidate[Invalidate generation]
  Invalidate --> Fail[Fail pending waiters]
  Invalidate --> Close[Close old connection]
  Invalidate --> Snapshot[Publish latest snapshot]
  Late[Late result or handshake] --> Discard[Discard result or close connection]

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