obsidian-cli: `silent` flag no longer exists, and `--copy`/`--json` only work after the command

Summary

Two things in skills/obsidian-cli/SKILL.md don't match the current CLI (verified against Obsidian 1.12.7 on Arch Linux, plugin v1.0.1 / main):

1. The silent flag no longer exists, and the default it describes has inverted.
2. --copy / --json / --md / --tsv / --csv only work after the command, not before it — but "use --copy on any command" reads as though placement is free.

Both fail quietly, which is what makes them worth fixing: an agent following the skill gets no error, just no effect.

1. silent was removed; opening is now opt-in

SKILL.md mentions it three times (lines 25, 49, 60):

Use silent to prevent files from opening.

But obsidian help in 1.12.7 lists no silent on any command. For create it's now:

  create                Create a new file
    name=<name>         - File name
    path=<path>         - File path
    content=<text>      - Initial content
    template=<name>     - Template to use
    overwrite           - Overwrite if file exists
    open                - Open file after creating
    newtab              - Open in new tab

So creating no longer opens the note by default — open is the opt-in. Same shape on daily:append / daily:prepend.

Unknown flags are ignored rather than rejected, so obsidian create name="X" content="Y" silent exits 0 and looks correct. Nothing surfaces the fact that silent is a no-op, so the stale advice survives indefinitely.

Suggested fix: drop silent from the three spots and note that opening is opt-in via open / newtab.

2. Output-format and --copy flags must follow the command

Line 60 says "Use --copy on any command", which invites putting it up front, next to vault=. That fails:

$ obsidian --copy vault="MyVault" tasks todo total
Error: Command "--copy" not found. It may require a plugin to be enabled.

$ obsidian --md vault="MyVault" tasks todo total
Error: Command "--md" not found. Did you mean: read?

$ obsidian vault="MyVault" tasks todo total --copy
285

The double-dash flags are filtered out of argv but left in place, so whichever one comes first becomes the command name. vault= is genuinely position-sensitive (first, as documented) while these must come after the command — worth stating explicitly, since the two rules pull in opposite directions.

Related: list commands also accept format=json|tsv|csv as a parameter (tasks, search:context), which is easier to get right than --json and is currently undocumented in the skill:

$ obsidian vault="MyVault" tasks todo format=json
[
  {
    "status": " ",
    "text": "- [ ] Some task",
    "file": "Inbox.md",
    "line": "12"
  },

Not filing: vault targeting

I hit a third problem — with several registered vaults, omitting vault= targets the most-recently-focused vault, returns that vault's data, and makes Obsidian open a window for it to service the request. That's already #49, so I'll leave it there rather than split the discussion. (FWIW 1.12.7 does have the vaults command that proposal needs: vaults — List known vaults.)

Happy to send a PR for the two items above if useful.