fix(pscad): reliable runs + working .psout reader (release 0.1.4)

[qian-harvard]

Summary

The PSCAD MCP server could not run a simulation or read its results end-to-end. This PR fixes the blocking defects and bumps powermcp to 0.1.4. Verified by running PSCAD/data/MMC/MMC_HalfBridge_Bipole.pscx (a 5 s MMC-HVDC bipole) entirely through the MCP, producing a 42 MB .psout (364 channels) that the new reader analyzes.

Fixes

• Non-blocking run — run_project now uses Project.start() + get_run_status polling (building/running/idle_or_finished). The old blocking Project.run() timed out under the 30 s watchdog and held the single-worker executor for the whole run, so status polling was impossible.
• Working results reader — rewrote read_output_file to the real mhi.psout 1.3 API (the previous mhi.psout.open()/channels()/values() API does not exist). Added list_output_channels and read_output_channels (listing, selective reads, summary stats, downsampling) so files with hundreds of channels x tens of thousands of samples are usable; the .psout is auto-located via Project.temp_folder.
• Project settings — get/set_project_settings now use Project.parameters() (the project.settings attribute does not exist); this is what enables setting PlotType=PSOUT.
• Executor COM lifecycle — initialize COM once for the single worker thread; the previous per-call CoInitialize/CoUninitialize invalidated mhi's cached WMI object ("object invoked has disconnected from its clients") on the 2nd+ launch. Added an opt-in _timeout override for long load/build calls.
• Connection robustness — attach_local scrubs NoDefaultCurrentDirectoryInExePath before launching PSCAD (when set, PSCAD's generated EMTDC run batch cannot find its own solver: "<project>.exe is not recognized"), uses a 120 s attach timeout, and falls back to mhi.pscad.launch() when no attachable instance is running.
• Build pre-flight — new build_project and get_build_messages tools surface compiler/link errors before a long run.

Tests

• PSCAD unittest suite: 17/17 pass.
• Reader validated against a real .psout.
• Root tests/ unaffected (changes confined to PSCAD/).

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