lnk_stamp: export model parameters for report appendix

[NewGraphEnvironment]

Problem

No way to export the exact parameters that drove a habitat classification run for report appendices. Parameters spread across CSVs, YAML, and function arguments.

Proposed Solution

lnk_stamp() — exports all classification parameters into a structured human-readable document.

Captures: species dimensions CSV, thresholds CSV, rules YAML (plain language), access model params, overrides applied, software versions, NGE stances.

stamp <- lnk_stamp(conn, 
  rules = "inst/extdata/parameters_habitat_rules.yaml",
  dimensions = "inst/extdata/parameters_habitat_dimensions.csv")
writeLines(stamp$markdown, "appendix_model_parameters.md")

Ties report version to parameter set for reproducibility.

Versions

• fresh: 0.12.5, link: 0.0.0.9000

Relates to #16, #19, #22
Relates to NewGraphEnvironment/sred-2025-2026#24

[NewGraphEnvironment]

Closing — lnk_stamp() + lnk_stamp_finish() are implemented and exported (R/lnk_stamp.R, NAMESPACE confirms). The function captures cfg + loaded overrides + session info into a structured stamp consumed by report appendices. Use case described in this issue is delivered.