Redesign CLI interface

[O6lvl4]

Problem

The current CLI requires running through almide run, making it verbose and unintuitive:

almide run src/main.almd -- --lang python mylib.almd

Users must know the internal entry point path (src/main.almd) and use -- to separate almide flags from lander flags.

Desired Interface

# After `almide build` produces a standalone binary:
lander --lang python mylib.almd
lander --lang python,go,swift mylib.almd
lander --list
lander --dry-run --lang almide mylib.almd
lander mylib.almd                          # default: all languages? or prompt?

Or as an almide subcommand:

almide land --lang python mylib.almd

Issues with Current CLI

1. Verbose invocation — almide run src/main.almd -- is boilerplate
2. No standalone binary distribution — must clone the repo to use
3. --help formatting — language list indentation is broken
4. No default behavior — lander mylib.almd without --lang should do something useful
5. Output naming — generated files use .txt extension for almide target instead of .almd
6. No --output flag — can't control individual output filenames
7. Step counter bug — shows [3/false] instead of correct step numbers

Proposal

• Build lander as a standalone binary (almide build src/main.almd -o lander)
• Publish as a downloadable tool or almide install almide/almide-lander
• Fix help text formatting
• Fix step counter
• Use .almd extension for almide target output
• Add sensible defaults (e.g., --lang all or interactive selection)