feat(cli): add ccc version

[junzh0u]

Adds ccc version, which prints the CLI version.

Today the version is only reachable through ccc daemon status or ccc doctor, and both report it by connecting to the daemon. That leaves no answer to "what version are you on?" for the case where it matters most — a user whose daemon won't start, filing a bug. ccc version answers offline: no project discovery, no settings, no daemon.

It reads the same _version.__version__ the daemon handshake compares against, so the CLI and the version check can't drift apart.

Try it

$ ccc version
0.2.40.dev1+gbeba2cfc8

Works from any directory — no initialized project, no global settings, no running daemon required. It shows up in the top-level help alongside the rest:

$ ccc --help
╭─ Commands ───────────────────────────────────────────────────────────────────╮
│ init     Initialize a project for cocoindex-code.                            │
│ index    Create/update index for the codebase.                               │
│ search   Semantic search across the codebase.                                │
│ grep     Structurally grep code by example (no index or daemon required).    │
│ status   Show project status.                                                │
│ reset    Reset project databases and optionally remove settings.             │
│ doctor   Check system health and report issues.                              │
│ mcp      Run as MCP server (stdio mode).                                     │
│ version  Print the CLI version.                                              │
│ daemon   Manage the daemon process.                                          │
╰──────────────────────────────────────────────────────────────────────────────╯

Operational impact

None. Purely additive — a new subcommand, no change to existing commands, settings, protocol, or on-disk state. No migration. The daemon's version reporting stays exactly where it was in ccc daemon status and ccc doctor; this reports the client's, which can legitimately differ from a running daemon's.

Docs updated: README command table and the CLAUDE.md subcommand list.

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