feat(commands): tier-1 PC tools — window mgmt, clipboard, notes, process killer, web search

Five new portable Lua command packs. Bumps the total from 11 to 16 packs.
All sandbox=full, all dispatched via jarvis.system.exec or jarvis.fs / jarvis.system
APIs, no new Rust code, post_build.py --sync copies them under target/.
cargo test -p jarvis-core --lib commands::tests passes 3/3 against all 16.

window/ — 8 commands, single dispatch.lua keyed by jarvis.context.command_id:
  show_desktop / maximize_window / minimize_window / snap_left / snap_right
  / close_window / restore_all / task_view. _window_helper.ps1 P/Invokes
  user32!keybd_event for arbitrary combos like "win+d", "alt+f4",
  "win+shift+m". Uses one shared script per pack — much less duplication
  than the volume/ approach.

clipboard_read/ — read_clipboard. Pulls jarvis.system.clipboard.get(),
caps preview at 400 chars, then shells PowerShell System.Speech to actually
speak it aloud (auto-picks the first ru-RU voice if present). Also fires a
notify with a 120-char snippet.

notes/ — add_note + open_notes. add_note strips the trigger phrase from
the recognized voice, appends "[YYYY-MM-DD HH:MM] body\n" to
%USERPROFILE%\Documents\jarvis-notes.txt via jarvis.fs.append (creates
the file on first call). open_notes opens the file in the default editor
via jarvis.system.open. Trigger list covers RU/EN/UA variants of
"запиши" / "запомни" / "write down" / etc.

process_kill/ — kill_process. Trigger-strips "закрой программу" / "убей
процесс" / etc., then runs the remainder through an alias map (хром→
chrome, телега→telegram, спотифай→spotify, edge/edge/едж→msedge etc.,
20+ entries) before invoking taskkill /F /IM. Notifies success/not-found.

websearch/ — search_google / search_youtube / search_wiki / search_yandex.
Single dispatch.lua reads jarvis.context.command_id to pick the base URL,
URL-encodes the query (Lua %02X gsub, not relying on jarvis.http), opens
the resulting link via jarvis.system.open (system default browser).

Portability check: every helper resolves paths via $env:USERPROFILE /
jarvis.context.command_path / jarvis.system.env — no hardcoded C:\ refs.

resources/commands/clipboard_read/read.lua

@@ -0,0 +1,33 @@
+local lang = jarvis.context.language
+local raw = jarvis.system.clipboard.get() or ""
+local text = raw:gsub("^%s+", ""):gsub("%s+$", "")
+
+if text == "" then
+    jarvis.system.notify(
+        lang == "ru" and "Буфер" or "Clipboard",
+        lang == "ru" and "Пусто" or "Empty"
+    )
+    jarvis.audio.play_not_found()
+    return { chain = false }
+end
+
+local preview_chars = 400
+local to_speak = text
+if #to_speak > preview_chars then
+    to_speak = to_speak:sub(1, preview_chars) .. (lang == "ru" and " ... и так далее" or " ... and so on")
+end
+
+local sapi_text = to_speak:gsub("'", "''"):gsub("\r?\n", " ")
+local ps = string.format(
+    [[Add-Type -AssemblyName System.Speech; $s = New-Object System.Speech.Synthesis.SpeechSynthesizer; foreach ($v in $s.GetInstalledVoices()) { if ($v.VoiceInfo.Culture.TwoLetterISOLanguageName -eq 'ru') { try { $s.SelectVoice($v.VoiceInfo.Name); break } catch {} } } $s.Speak('%s')]],
+    sapi_text
+)
+local cmd = string.format('powershell -NoProfile -ExecutionPolicy Bypass -Command "%s"', ps:gsub('"', '\\"'))
+jarvis.system.exec(cmd)
+
+jarvis.system.notify(
+    lang == "ru" and "Буфер" or "Clipboard",
+    text:sub(1, 120)
+)
+jarvis.audio.play_ok()
+return { chain = false }