Add an optional terminal interface for managing Voxel deployments - #51

- adds resolved command and execution context
- supervises lifecycle child processes and durable logs
- collects bounded Falcon and node telemetry
- persists and resumes detached terminal sessions
- coordinates cancellation aware side effects

- adds terminal actions events and effects
- implements the central application reducer
- gates lifecycle requests against observed state
- handles cancellation detach and quit transitions
- tests reducer outcomes and bounded logs

- manages terminal input rendering and restoration
- renders deployment monitoring help and confirmation views
- adds responsive topology and resource inspection
- preserves navigation and selection across layouts
- tests rendering input and layout behavior

- adds interactive TUI commands and dependencies
- resolves upstream dependency integration

- fixes the y shortcut for non detach confirmation dialogs
- adds a regression test for launch confirmation

- preserves resolved sled addresses across detach and resume
- routes resumed probes through bounded SSH without serial console output
- writes Falcon diagnostics to the durable TUI log
- keeps direct router probes on their existing Falcon serial path

- documents retained terminal phase progress
- defines monotonic advisory phase behavior
- specifies focused verification coverage

- adds Oximeter and Nexus metric collection
- renders live rack and resource monitoring views
- adds external monitoring access and connection guidance
- adds focused observability tests

- moves external monitoring access to contextual x guidance
- removes redundant overlay close labels
- highlights focused topology chrome without recoloring graph content
- adds rendering and shortcut regression coverage

- consolidates reqwest on the upstream compatible version
- makes initial collector cadence selection deterministic
- regenerates the dependency lockfile

- reserves startup admission before telemetry collection can acquire the gate
- adds regression coverage for startup ordering

- updates TUI control flow for current clippy guidance
- documents intentional constructor and response tuple shapes

- classifies Falcon teardown and storage cleanup output
- adds regression coverage from the observed destroy log

- adds visible_traffic_error to hide router collection errors recorded before the last reconciliation
- applies the filter to the health summary the compact inspector and the node detail pane
- adds render tests covering the hidden and the post reconciliation cases

- clears a deferred detach when quit is requested so the quit confirmation opens
- adds tests for deferring detach during an active launch and for reaching quit while it is pending

- collects each rack oximeter cycle concurrently instead of one rack at a time
- runs traffic and diagnostic queries independently so a slow query no longer delays the others
- splits the combined ZFS query into separate allocated and total queries
- filters missing zone CPU values before selecting the latest sample
- schedules the health and traffic cadences from completion deadlines so a slow traffic cycle cannot starve health

- adds a Nexus readiness probe that authenticates once without querying timeseries
- adds NexusAvailable and NexusUnavailable events tracked per rack
- skips oximeter traffic and diagnostic queries while Nexus is unreachable and reports the failure once
- explains the control plane impact in the rack summary until Nexus recovers

- shortens the global deployment and monitoring key descriptions to one clause
- rewrites the dialog legend to name the action rather than describe it
- trims the health state legend wording

- replaces numeric view jumps with a single toggle
- separates section focus from within section movement
- simplifies help content and contextual footer cues
- updates navigation documentation and regression tests

- drops the c key and the cancel-and-leave confirmation it opened, which promised the same outcome as detach
- escalates x to force stop once a cancel is already in flight, so force stop keeps a key
- names the deployment and whether the TUI is left, instead of describing resources
- replaces the opaque Falcon boundary wording with what an operator will observe
- adds a test that the stop key escalates to force stop

- reads the level slog printed instead of tagging every stderr line as an error, which marked ordinary progress as failure
- scans only the leading tokens so the word WARN inside a message cannot promote it
- falls back to info rather than error for continuation lines, since a real failure still surfaces through the child exit status
- adds tests covering each level, a continuation line, and an embedded WARN

- renames the switch zones tier to sidecars
- removes the switch fabric label from the bus, which restated the tier below it
- shortens the node badge from SWZ to SC

- collapses the per-rack and all-rack fragments into one receiver YAML that grows with the rack count
- binds s to the receiver YAML and a to the guide URL, dropping u
- cuts the numbered steps and TLS note that the fragment already carries in its own comments
- drops the now-unused app argument from the pane draw