As a developer, I want to set up nabledge-1.x knowledge generation infrastructure so that kc.sh gen 1.4/1.3/1.2 can run

[kiyotis]

Situation

nabledge-6 and nabledge-5 knowledge generation works end-to-end with `kc.sh gen 6` and `kc.sh gen 5`. Nablarch 1.x (v1.4, v1.3, v1.2) are legacy versions still used in production, but no infrastructure exists to run the same pipeline for these versions.

Pain

`kc.sh gen 1.4` cannot run because:

• `.lw/nab-official/v1.4/` does not exist (no symlink to local docs)
• knowledge-creator does not accept `--version 1.4`, `1.3`, or `1.2`
• No catalog files (.cache/v1.4/catalog.json, etc.)
• No mapping files (mappings/v1.4.json, etc.)
• No skill structures (.claude/skills/nabledge-1.4/, etc.)

Benefit

• Developers can run `kc.sh gen 1.4`, `kc.sh gen 1.3`, `kc.sh gen 1.2` to generate knowledge files
• Issues As a developer, I want to generate all nabledge-1.4 knowledge files so that users can access complete documentation #122, As a developer, I want to generate all nabledge-1.3 knowledge files so that users can access complete documentation #123, As a developer, I want to generate all nabledge-1.2 knowledge files so that users can access complete documentation #124 (actual generation) are unblocked

Success Criteria

• Symlinks exist: `.lw/nab-official/v1.4/1.4_maintain`, `.lw/nab-official/v1.3/1.3_maintain`, `.lw/nab-official/v1.2/1.2_maintain`
• knowledge-creator accepts `--version 1.4`, `--version 1.3`, `--version 1.2` (run.py choices updated)
• kc.sh passes 1.x versions through to run.py correctly
• Catalog files created: `.cache/v1.4/catalog.json`, `.cache/v1.3/catalog.json`, `.cache/v1.2/catalog.json`
• Mapping files created: `mappings/v1.4.json`, `mappings/v1.3.json`, `mappings/v1.2.json`
• Skill structures created: `.claude/skills/nabledge-1.4/`, `.claude/skills/nabledge-1.3/`, `.claude/skills/nabledge-1.2/`
• E2E tests cover v1.4/v1.3/v1.2 with same assertions as v5/v6
• `kc.sh gen 1.4 --dry-run` completes without error
• README and setup.sh document the symlink process for 1.x versions