Optimize tool descriptions for token efficiency (#73)

* Optimize background-task tool descriptions for token efficiency

- BACKGROUND_TASK_DESCRIPTION: 571 chars → 127 chars
- BACKGROUND_OUTPUT_DESCRIPTION: 268 chars → 95 chars
- BACKGROUND_CANCEL_DESCRIPTION: 374 chars → 83 chars

Follows token efficiency improvements pattern from PR #71.

🤖 Generated with assistance of OhMyOpenCode (https://github.com/code-yeongyu/oh-my-opencode)

* Optimize call-omo-agent tool description for token efficiency

- CALL_OMO_AGENT_DESCRIPTION: 841 chars → 156 chars (~81% reduction)
- Follows pattern from PR #71 where LSP tool descriptions were optimized
- Maintains core information while removing redundant explanations

🤖 Generated with assistance of OhMyOpenCode (https://github.com/code-yeongyu/oh-my-opencode)

* Optimize look-at tool description for token efficiency

🤖 Generated with assistance of OhMyOpenCode (https://github.com/code-yeongyu/oh-my-opencode)

* Optimize interactive-bash tool description for token efficiency

346 chars → 130 chars (~62% reduction), following PR #71 pattern.

🤖 Generated with assistance of OhMyOpenCode

src/tools/interactive-bash/constants.ts

@@ -11,12 +11,6 @@ export const BLOCKED_TMUX_SUBCOMMANDS = [
   "pipep",
 ]
 
-export const INTERACTIVE_BASH_DESCRIPTION = `Execute tmux commands for interactive terminal session management.
+export const INTERACTIVE_BASH_DESCRIPTION = `Execute tmux commands. Use "omo-{name}" session pattern.
 
-Use session names following the pattern "omo-{name}" for automatic tracking.
-
-BLOCKED COMMANDS (use bash tool instead):
-- capture-pane / capturep: Use bash to read output files or pipe output
-- save-buffer / saveb: Use bash to save content to files
-- show-buffer / showb: Use bash to read buffer content
-- pipe-pane / pipep: Use bash for piping output`
+Blocked (use bash instead): capture-pane, save-buffer, show-buffer, pipe-pane.`