docs(obsidian-cli): sync with current CLI behavior

[half-adder]

Summary

The obsidian-cli SKILL.md had drifted from the CLI's current behavior. This PR updates the documentation to match what the CLI actually does (verified empirically on the current release) and adds commonly-used command examples.

Changes

Behavior corrections (each verified by running the command):

• silent flag no longer exists in the CLI. Replaced silent overwrite example with open overwrite (the explicit opt-in flag). The trailing note is reworded to reflect that silent is now the default.
• File targeting: the previous wording ("Without either, the active file is used") was only true for content commands. List/aggregation commands (aliases, properties, tags, tasks) default to vault-wide and require the active flag to scope to the active file. Verified:
  • obsidian properties (no args) → vault-wide property list
  • obsidian properties active → active note's frontmatter
  • obsidian tags / tags active → same pattern
  • obsidian read / outline (no args) → active file content (content default)
• active flag is now documented.

New command examples in Common patterns:

• rename — rename a file
• move — move/relocate a file
• search:context — search with surrounding context
• daily:path — get expected daily note path
• create ... open — create and open in one step

obsidian move quirk documented:

to= must be a full destination path including the filename. Passing a folder (with or without trailing slash) fails with "Destination file already exists." Verified:

• to="folder/" → error
• to="folder" → error
• to="folder/file.md" → success

The command's --help says to=<path> with the description "Destination folder or path (required)", but in practice only a full file path works.

Documentation tip:

• Added a note about obsidian help <command> (or <command> --help) for per-command detail.

Test plan

• Verified silent flag is absent from current CLI help (obsidian create --help)
• Verified open flag exists on create and works as opt-in
• Verified content commands (read, outline) default to active file
• Verified list commands (aliases, properties, tags, tasks) default to vault-wide
• Verified active flag scopes list commands to active file
• Verified obsidian move folder-target failure and filename workaround