fix: hide generated job scripts

[njzjz]

Summary

• prefix generated per-job submission and run scripts with a dot so normal directory listings omit dispatcher artifacts
• preserve the existing work-root layout, job hashes, recovery, resubmission, and scheduler behavior
• cover scheduler-wide generation, LazyLocal recovery/resubmission, and cloud archive upload paths
• document the hidden artifact names

Closes #400

Validation

• full unit suite: 168 passed, 42 skipped
• focused scheduler, LazyLocal, recovery, resubmission, and cloud tests passed
• uvx pre-commit run --all-files passed
• changed-file Pyright passed
• CLI and documentation builds passed with existing warnings

Repository-wide Pyright retains unrelated baseline diagnostics.

Coding agent: Codex
Codex version: codex-cli 0.149.0
Model: gpt-5.6-sol
Reasoning effort: xhigh

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Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: b688c0b6-45dd-49f0-b932-be64da870578

📥 Commits

Reviewing files that changed from the base of the PR and between 34ddb4b and a93d1e7.

📒 Files selected for processing (3)

• doc/getting-started.md
• dpdispatcher/submission.py
• tests/test_hidden_job_scripts.py

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 51.08%. Comparing base (34ddb4b) to head (a93d1e7).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #646      +/-   ##
==========================================
+ Coverage   48.38%   51.08%   +2.70%     
==========================================
  Files          40       40              
  Lines        3960     3960              
==========================================
+ Hits         1916     2023     +107     
+ Misses       2044     1937     -107     

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