CharlesBinard / SecurBuntu / 23200958076

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feat: add local mode — run SecurBuntu directly on the machine (#12)

* docs: add local mode design spec

Design for running SecurBuntu directly on the local machine without SSH.
Introduces SystemClient abstraction, LocalClient implementation, and
mode selection prompt.

* docs: update local mode spec after review

Address all review findings: complete rename scope, whoami-via-sudo
fix, remove unnecessary local/detect.ts, refactor executeAndReport
signature, rename decorator classes, and add integration test plan.

* docs: add local mode implementation plan

13-task plan covering: SshClient→SystemClient rename, LocalClient
implementation, mode selection, orchestrator decoupling, lockout
prevention, whoami fix, and prompt adjustments for local mode.

* refactor: rename SshClient to SystemClient in types.ts

Rename the interface and update HardeningTask parameter name from
ssh to client. Add ConnectionResult interface for upcoming local
mode support.

* refactor: rename SshClient type and ssh params to SystemClient/client

Rename the SshClient type reference to SystemClient across all source
files. Rename ssh parameter to client in all functions that take a
SystemClient, preparing for the local execution mode.

* refactor: rename DryRunSshClient and LoggingSshClient to DryRunClient and LoggingClient

Drop the Ssh prefix from decorator classes since they wrap a generic
SystemClient, not specifically an SSH connection.

* refactor: rename MockSshClient to MockSystemClient in all test files

Update the mock class name and all 13 test files that import it to
align with the SystemClient interface rename.

* test: add failing tests for LocalClient

Cover exec, execWithStdin, writeFile/readFile round-trip,
fileExists, isRoot, close no-op, and timeout behavior.

* feat: implement LocalClient for local system execution

Reuses spawnProcess and shellEscape from SSH module. Supports three
modes: root (direct exec + Bun file I/O), sudo with password
(sudo -S piped s... (continued)

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