* Add mt5cli agent skill
Document mt5cli CLI usage (global options, subcommands, parameter formats,
and examples) so agents can invoke the exporter without re-reading the CLI
source.
* Move mt5cli skill to top-level skills/ with symlink
Mirror the conventional layout: keep the canonical SKILL.md under
skills/mt5cli/ and expose it through a .agents/skills/mt5cli symlink.
* Harden mt5cli skill against leaking --password
Add a guideline warning against passing --password on the command line
(visible in ps/history/logs), and drop the credential-inline example that
modeled the bad pattern.
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Co-authored-by: Claude <noreply@anthropic.com>
Daichi Narushima