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Mathieu Virbel 5affaf77a5 feat: deny-by-default filesystem isolation ...

Flip the sandbox from allow-by-default reads (--ro-bind / /) to
deny-by-default (--tmpfs / with selective mounts). This makes the
sandbox safer by default — only system paths, CWD, and explicitly
allowed paths are accessible.

- Config: DefaultDenyRead is now *bool (nil = true, deny-by-default)
  with IsDefaultDenyRead() helper; opt out via "defaultDenyRead": false
- Linux: new buildDenyByDefaultMounts() using --tmpfs / + selective
  --ro-bind for system paths, --symlink for merged-usr distros (Arch),
  --bind for CWD, and --ro-bind for user tooling/shell configs/caches
- macOS: generateReadRules() adds CWD subpath, ancestor traversal,
  home shell configs/caches; generateWriteRules() auto-allows CWD
- Landlock: deny-by-default mode allows only specific user tooling
  paths instead of blanket home directory read access
- Sensitive .env files masked within CWD via empty-file overlay on
  Linux and deny rules on macOS
- Learning templates now include allowRead and .env deny patterns

2026-02-12 20:15:40 -06:00

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