feat: add Base table copy shortcuts

[fongwave]

Summary

Add Base shortcuts for copying a table and querying asynchronous copy status. Table copies default to schema-only, with explicit support for copying all records and optionally waiting for completion.

Changes

• Add base +table-copy with table ID/name support, schema-safe defaults, asynchronous continuation output, and bounded wait polling.
• Add base +table-copy-status for one-shot task status queries using the original identity.
• Register structured Base copy error codes and preserve typed API errors.
• Add unit, dry-run E2E, workflow E2E, and Skill guidance for the new commands.

Test Plan

• make unit-test
• go vet ./...
• gofmt -l .
• go mod tidy leaves go.mod and go.sum unchanged
• golangci-lint reports 0 issues
• Base CLI E2E package passes
• Manual verification confirms schema-only, all-record, wait, and no-wait flows

Related Issues

• None

[CLAassistant]

All committers have signed the CLA.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/base-table-copy

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[codecov]

Codecov Report

❌ Patch coverage is 84.29752% with 57 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.10%. Comparing base (d4168ab) to head (8181f66).
⚠️ Report is 18 commits behind head on main.

Files with missing lines	Patch %	Lines
shortcuts/base/table_copy_ops.go	89.16%	15 Missing and 11 partials ⚠️
shortcuts/base/table_copy_poll.go	63.76%	19 Missing and 6 partials ⚠️
shortcuts/base/table_copy.go	84.61%	3 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2019      +/-   ##
==========================================
+ Coverage   75.05%   75.10%   +0.05%     
==========================================
  Files         901      906       +5     
  Lines       95391    96305     +914     
==========================================
+ Hits        71591    72329     +738     
- Misses      18307    18417     +110     
- Partials     5493     5559      +66     

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