CharlesBinard / SecurBuntu / 23269631865

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fix: SSH connection hang, Ctrl+C support, and directory path crash (#14)

* 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.

* docs: add cross-platform support & OS detection design spec

* docs: add cross-platform OS detection implementation plan

* fix: SSH connection hang on rejected key, Ctrl+C support, and directory path crash

- Add PreferredAuthentications=publickey for key auth to prevent SSH from
  falling back to password prompt and hanging indefinitely when key is not
  on the server
- Add SIGINT/SIGTERM handlers in spawnProcess to kill child SSH process,
  allowing Ctrl+C to cancel during connection
- Add directory check in SSH key path prompt to prevent EISDIR crash

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Co-authored-by: Charles Binard <charles@notae.ai>

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