Declare missing deps + make sibling-package calls explicit

[vertesy]

Summary

1. Fixes 2 bare calls that were missing dependencies: FirstCol2RowNames -> ReadWriter::column.2.row.names (upgrades to the non-deprecated name), and qbarplot -> guarded ggExpress::qbarplot.
2. Makes all other 71 bare calls to Stringendo explicit (Stringendo::function()). No behavior change.

Why

CodeAndRoll2 is meant to be a low-level, near-dependency-free package. The 2 calls in (1) only worked because ReadWriter/ggExpress happened to already be loaded elsewhere. The 71 calls in (2) already worked correctly (Stringendo is in Depends:), but writing them explicitly makes the source of every function obvious at a glance.

Scope

Only calls into CodeAndRoll2's own dependency packages were touched. External libraries and base R are untouched -- that's a separate pass.

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[vertesy]

@copilot

Please resolve the following issue, From a comment above.

"P1 Badge Declare dependencies in the metadata source

Problem: ReadWriter and ggExpress were added only to generated DESCRIPTION; Development/config.R still omits both packages. Trigger: The next package rebuild regenerates DESCRIPTION, removes these declarations, and can leave ReadWriter::column.2.row.names() without an installed dependency. Fix: Add ReadWriter and ggExpress to the appropriate fields in Development/config.R, update the dependency source, and regenerate DESCRIPTION."

Otherwise, check if we are really ready to merge this and there are no problems with this PR.

[Copilot]

@copilot

Please resolve the following issue, From a comment above.
...

Addressed in cc8b9d9: added ReadWriter to Development/config.R imports and ggExpress to suggests, kept DESCRIPTION in sync, updated the dependency snapshots, and bumped the package version to 2.8.6. I also ran metadata consistency checks, secret scanning, automated code review, and CodeQL (no analyzable code changes for CodeQL). R CMD check could not be run here because R/Rscript is not installed in the runner.