nx_wiki_page_save.nx

nx_wiki_page_save.nx -- wiki R1: the AUTH-GATED page EDIT + SAVE backbone. Adds the ability to EDIT a wiki page and SAVE it, persisted to the sovereign append-only seg_store, so the new content renders + is searchable, and every save is an IMMUTABLE revision (this is R2 versioning's history substrate). SECURITY-CRITICAL: a save is permitted ONLY when the caller presents a VALID session token. The auth gate REUSES the proven validator already shipping in the wiki -- hub/nx_modern_auth_flow::nx_modern_auth_validate_session (the exact OPAQUE/no-cookie Ed25519 session check nx_wiki_admin_handle uses on every protected request). NO new/weaker auth is invented here. An unauthenticated edit is REFUSED and persists NOTHING. COMPOSES (avoid-duplicate-primitives cardinal; each imported ONCE): hub/nx_modern_auth_flow nx_modern_auth_validate_session (the auth gate) wiki/nx_wiki_index_builder NxWikiDocStore (+ find_by_url, lookup, add, the new update_body_by_url) -- in-memory store the read/render/search paths already consult nx_seg_store ss_begin / ss_add / ss_commit (persist) + ss_open / ss_hget (read overlay back) COMPOSED BY: wiki/nx_wiki_edit_handler GET/POST /wiki/<slug>/edit HTTP handlers wiki/nx_wiki_main startup overlay loader (seg_store > .md) runtime/_hdl_build/_wiki_edit_gate unit gate (authed save, unauth refuse, readback, revision) PERSISTENCE MODEL (additive-data law, cardinal 13): prefix "knowledge/store/wikipage-" key wikicur:<slug> value = current markdown bytes key wikirev:<slug>:<epoch> value = "author=<a>\nepoch=<e>\n" + content Every save = a NEW segment (ss_commit). Old segments are never mutated or deleted; wikicur:<slug>'s LATEST put wins on read (ss_hget), the wikirev:* rows accumulate as the immutable revision log R2 walks. Status: R1. 2026-06-14. license_tier: ORIGINAL