Stabilize 1.x Node packaging and Codex MCP setup

[scholarsmate]

Summary

• carry the working dual-package Node packaging and MCP/Codex setup onto the new
  elease/1.x maintenance line
• add cross-platform workspace packing and dist package metadata helpers
• document why scripts/write-dist-package-jsons.js exists and what problem it solves

Why

This gives us a working 1.x branch we can fall back to while main moves toward a cleaner ESM-only / 2.x refactor. The code here is intentionally the pragmatic compatibility version, not the long-term shape.

Included

• Polish MCP packaging and Codex setup
• docs: explain dist package postbuild helper

Validation

• previously validated on main before branching: packaged consumer install, CJS/ESM imports for @omega-edit/client and @omega-edit/ai, oe --help, MCP initialize plus ools/list, and yarn workspace @omega-edit/ai test
• no new runtime changes after that validation other than docs for the packaging helper

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.03%. Comparing base (13c818a) to head (f2a3b02).
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Additional details and impacted files

@@               Coverage Diff               @@
##           release/1.x    #1334      +/-   ##
===============================================
- Coverage        77.05%   77.03%   -0.03%     
===============================================
  Files               32       32              
  Lines             6254     6248       -6     
  Branches          1318     1318              
===============================================
- Hits              4819     4813       -6     
  Misses             877      877              
  Partials           558      558              

Flag	Coverage Δ
native	59.26% <ø> (ø)

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Files with missing lines	Coverage Δ
packages/client/src/server.ts	72.43% <ø> (-0.15%)	⬇️

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