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Joseph Doherty 32055c2238 docs(mesh): Phase 2 live-gate record + correct the buffer-size rationale
Flipped the docker-dev rig end-to-end to MeshTransport:Mode=ClusterClient
(OTOPCUA_MESH_MODE, no rebuild) and ran the gate. PASSED for the transport:
deploy seals on ClusterClient, a stopped node fails the deploy naming it, the
MaintenanceMode hatch shrinks the DB-sourced contact set live (6->5->6 on both
centrals independently), and the frame-size canary stayed silent.

Four findings, recorded in 2026-07-22-mesh-phase2-live-gate.md:

  A. A 10-30s post-restart delivery window exists, but the DPS control fails
     identically -- it is a cluster-convergence property, not a Phase 2
     regression. Running the control is the only reason this is a note and not
     a false attribution.

  B. buffer-size=0's stated rationale was OVERSTATED. A node applies a TimedOut
     deployment anyway -- live-observed at +44s -- via DriverHostActor.Bootstrap
     replaying the orphan Applying row on restart. Zero buffering removes the
     silent, timer-driven replay, not the boot-time DB one. Corrected in the
     plan decisions table, Configuration.md, and CLAUDE.md; the decision stands,
     the justification narrowed.

  C. Stopping BOTH centrals strands the non-seed nodes at the Akka membership
     layer (frozen mid-Exiting, not Unreachable, so auto-down does not help).
     Transport-independent; a Phase 7 downing/rejoin drill item.

  D. The AdminUI driver Restart/Reconnect buttons (DriverStatusPanel) are
     rendered by no page -- orphaned since v3 Batch 2 retired /clusters/{id}/
     drivers. So gate steps 6/7 could not run; the driver-control node-side leg
     is proven live only because DispatchDeployment shares its EventStream path.

Step 8's planned log-signal does not exist (HandleApplyAck is silent on
success); proven instead by both centrals independently logging per-instance
ClusterClient creation, which a singleton cannot.

Also adds a repo-root .dockerignore: docker-dev/Dockerfile does COPY . ., which
was pulling .claude/worktrees (19GB of agent checkouts with their own bin/obj)
into the build context and exhausting the Docker VM disk mid-COPY.

Rig restored to Mode=Dps, six members, no leftover maintenance flags.

Claude-Session: https://claude.ai/code/session_01GASWkNEi68FSCtvr6rLoEW
2026-07-22 18:40:42 -04:00

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# Build context exclusions for docker-dev/Dockerfile, whose `COPY . .` takes the whole repo.
#
# Without this file the context also carries every project's bin/obj AND .claude/worktrees — agent
# worktrees that are themselves full checkouts WITH their own build outputs. That reached ~19 GB and
# exhausted the Docker VM's disk mid-COPY, failing the rig build with "no space left on device"
# rather than anything a build log would attribute to the repo.
#
# Nothing excluded here is needed: the build restores and publishes inside the image, and the
# migrator stage runs `dotnet ef` against the same restored source.
# Agent worktrees — full checkouts, build outputs and all.
.claude/
# Local build outputs; the image builds its own.
**/bin/
**/obj/
artifacts/
# VCS + editor state.
.git/
.gitignore
.vs/
.vscode/
.idea/
# Docker's own state, and anything the image would never read.
**/.DS_Store
**/*.user
docker-dev/**/*.log