Watershed group x ecoregion overlap section + canonical 16-WSG list

[NewGraphEnvironment]

Summary

Adds a "Watershed Groups Across Ecoregions" section to the peace-fwcp vignette and canonicalizes the FWCP Peace watershed-group list to 16. Lets readers connect per-ecoregion climate-departure findings to the watershed-group reporting unit (the unit FWCP funds work in, the unit our fish-passage reports use).

Headline additions:

• New map: 16 canonical FWCP Peace watershed groups labelled with codes, on top of ecoregion fills.
• New table: per-watershed-group share of area in each of the five ecoregions.
• Canonical 16-WSG list hardcoded in data-raw/example_context_fwcp_peace.R for reuse: CARP, CRKD, FINA, FINL, FIRE, FOXR, INGR, LOMI, MESI, NATR, OSPK, PARA, PARS, PCEA, TOOD, UOMI. Each is ≥99% inside the FWCP polygon. Drops UPCE (11.8% inside; main drainage runs east past FWCP) and MURR (1% sliver).

Other improvements rolled in:

• Recent vs Pre-warming consolidated to one table (variable, period, recent mean, pre-warming mean, Δ absolute, Δ %, trend p) instead of the previous two near-redundant tables. Single plain-language interp paragraph above the table states temperature/VPD/precipitation/SM signals cleanly.
• Spatial Pattern interp paragraph moved above the map so readers see the east-west gradient finding before the figure.
• Per-Ecoregion Variation gains a brief interp paragraph above the facets (uniform warming, precipitation diverges in the north, VPD up in all five).
• Day-night asymmetry headline moved into the section's intro paragraph so the reader sees the conclusion before the figures.
• Tightened acronyms: "AOI" → "area of interest", "BC" → "British Columbia". Removed the Arctic-draining clarification and the cross-vignette KOTL reference.
• load-vignette-data chunk now visible — reader sees how ts and downstream products materialize from the cache.
• Removed the bottom "A note on reproducibility" section (provenance is in chunk comments).

Caption fix worth calling out:

All six tables now render with single, clean bookdown captions. Fixed a kableExtra + bookdown double-caption issue: pass label = NA alongside caption = "..." to the inner knitr::kable(). The tab.cap chunk option I tried earlier silently drops captions when the table is wrapped in kable_styling() + scroll_box(). Memory updated.

Test plan

• data-raw/example_context_fwcp_peace.R runs end-to-end with the hardcoded 16-WSG list, regenerates the bundled gpkg with 16 WSGs
• data-raw/peace_wsg_ecoregion_commentary.R runs and produces the 16-row commentary CSV
• devtools::build_rmd("vignettes/peace-fwcp.Rmd") renders cleanly in ~10 s
• All 6 tables in the rendered html have unique, single Table N: prefixes (verified via grep on rendered html)
• WSG map shows the 16 codes labelled, ecoregion fills underneath
• Post-merge pkgdown CI passes

Notes

This vignette is the template for our three reporting climate-departure appendices and ports directly to fish_passage_peace_reporting_2025. The canonical 16-WSG list is the one to use in the shared GIS project setup going forward.

Fixes #47
Relates to NewGraphEnvironment/sred-2025-2026#23

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