kootenay vignette: drop Peace vignette cross-references

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Summary

• Removes cross-references to the Peace vignette throughout the Kootenay Lake vignette so the narrative stands alone.
• Tightens tone to factual / tactical: what is happening in the Kootenay Lake Region and what it means, without comparing to other reporting regions.
• Touched: recent-decade table preamble, snowpack section header, ASWS QA cross-check, snowpack-meaning section, cordillera-wide background, and the two Interpretation bullets (precipitation, snow) that previously framed findings against the Peace pattern. Also dropped the parenthetical Peace ref in the salmonid-habitat closer.

The institutional FWCP reference at the watershed-group section is kept — that's about the program that funds work in the AOI, not a vignette cross-ref. The build comment at the top referencing peace-fwcp.Rmd is also kept — it's a maintainer-facing instruction for the regen-bib script, which genuinely scans both vignettes.

Test plan

• Local pkgdown render: pkgdown::build_article("kootenay-lake") — confirm renders without unresolved citations
• Grep confirms no Peace narrative comparisons remain: grep -i peace vignettes/kootenay-lake.Rmd should return only the build comment and the institutional FWCP ref
• CI pkgdown build passes after merge

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