* docs: add ADR for filesystem as host-side implementation detail
Record the proposed decision that skills served over MCP MUST function
without a local filesystem, while hosts MAY materialize resources as an
optimization, with unified resolution semantics required either way.
* docs: link companion archive distribution ADR (#83)
* docs: update ADR date to 2026-04-19
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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: olaservo <16480113+olaservo@users.noreply.github.com>
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