diff --git a/docs/.vitepress/loaders/rfd-priority.mjs b/docs/.vitepress/loaders/rfd-priority.mjs
index 36911a0e9..53b4ef835 100644
--- a/docs/.vitepress/loaders/rfd-priority.mjs
+++ b/docs/.vitepress/loaders/rfd-priority.mjs
@@ -3,6 +3,15 @@
 // (`rfd-shared.mjs`) and the browser-side board (`RfdBoard.vue`) both consume
 // this module, so it must run in either environment.
 
+// Statuses that take an RFD off the priority board. The board ranks the work
+// that is still open (Draft, Discussion, Accepted); everything else is done or
+// dead and holds no position.
+export const TERMINAL_STATUSES = new Set([
+    'Implemented',
+    'Superseded',
+    'Abandoned',
+])
+
 // Normalize a raw priority record into a fixed shape:
 //
 // - `planned`: milestone groups in board order. Each group's `ids` are the
diff --git a/docs/.vitepress/loaders/rfd-shared.mjs b/docs/.vitepress/loaders/rfd-shared.mjs
index f6a3009b9..55ae8f176 100644
--- a/docs/.vitepress/loaders/rfd-shared.mjs
+++ b/docs/.vitepress/loaders/rfd-shared.mjs
@@ -3,7 +3,11 @@ import { readdirSync, readFileSync } from 'node:fs'
 import { resolve } from 'node:path'
 
 import { field, unescapeTitle } from './metadata.mjs'
-import { checkMilestones, normalizePriority } from './rfd-priority.mjs'
+import {
+    checkMilestones,
+    normalizePriority,
+    TERMINAL_STATUSES,
+} from './rfd-priority.mjs'
 import { inDevelopmentRfds, loadTickets } from './ticket-shared.mjs'
 
 // Shared parsing and validation for the RFD data loaders.
@@ -129,20 +133,14 @@ export function loadPriority(path) {
     return normalizePriority(raw)
 }
 
-// Statuses that take an RFD off the priority board. The board is the active
-// backlog the client prioritizes (Discussion, Accepted); everything else is
-// done or dead.
-export const TERMINAL_STATUSES = new Set([
-    'Implemented',
-    'Superseded',
-    'Abandoned',
-])
-
 // Annotate each entry with its board position and milestone. `priority` is the
 // index in the combined `order` + `backlog` list (lower = higher priority) or
-// `null` when the RFD hasn't been placed yet. `milestone` is the name of the
-// planned group the RFD sits in, or `null` (unassigned, backlogged, or
-// unplaced). Status is left untouched so the view can drop terminal RFDs itself.
+// `null` when the RFD holds no position. `milestone` is the name of the planned
+// group the RFD sits in, or `null` (unassigned, backlogged, or unplaced).
+//
+// A terminal RFD holds no position whatever the board file says. The file goes
+// stale as soon as a status changes, so membership is settled here, once, for
+// every surface.
 export function mergePriority(entries, priority) {
     const combined = [...priority.order, ...(priority.backlog ?? [])]
     const rank = new Map(combined.map((num, i) => [num, i]))
@@ -151,8 +149,9 @@ export function mergePriority(entries, priority) {
         for (const num of group.ids) milestoneOf.set(num, group.milestone)
     }
     for (const entry of entries) {
-        entry.priority = rank.has(entry.num) ? rank.get(entry.num) : null
-        entry.milestone = milestoneOf.get(entry.num) ?? null
+        const placed = !TERMINAL_STATUSES.has(entry.status) && rank.has(entry.num)
+        entry.priority = placed ? rank.get(entry.num) : null
+        entry.milestone = placed ? (milestoneOf.get(entry.num) ?? null) : null
     }
 }
 
@@ -180,11 +179,10 @@ export function mergeDependencies(entries, graph) {
     }
 }
 
-// Reject board entries that don't match a known published RFD. Numbers are
-// never reused, so an unknown id is real corruption (a hand-edit typo, or a
-// stale id), not the expected churn of an RFD becoming Implemented. Terminal
-// ids lingering in `order` are tolerated: they fall off on the next save and
-// the view filters them out meanwhile.
+// Reject board entries that don't match a known RFD. Numbers are never reused,
+// so an unknown id is real corruption: a hand-edit typo, or an id whose file
+// went away. A terminal RFD still listed on the board is a separate, milder
+// problem — see `checkTerminalOnBoard`.
 export function checkPriority(entries, priority) {
     const known = new Set(entries.map(e => e.num))
     const unknown = [
@@ -200,6 +198,33 @@ export function checkPriority(entries, priority) {
         `ids or remove them (the board UI rewrites this file on save).`
 }
 
+// Reject terminal RFDs listed on the priority board.
+//
+// The board ranks open work, so an Implemented, Superseded, or Abandoned RFD has
+// no place on it. `graph` supplies the statuses and must span every id space the
+// board can hold — drafts included, since a draft can be abandoned. Ids it
+// doesn't know are left to `checkPriority`.
+//
+// This is an error rather than a warning because the board file is what a human
+// reads and reorders: nothing renders a stale id, so nothing else would ever
+// point it out.
+export function checkTerminalOnBoard(graph, priority) {
+    const placed = [...priority.order, ...(priority.backlog ?? [])]
+    const terminal = [...new Set(placed)]
+        .filter(num => TERMINAL_STATUSES.has(graph.get(num)?.status))
+        .sort()
+
+    if (terminal.length === 0) return null
+
+    const report = terminal
+        .map(num => `  ${num} (${graph.get(num).status})`)
+        .join('\n')
+    return `Terminal RFDs on the priority board:\n${report}\n\n` +
+        `The board ranks work that is still open. Run ` +
+        `\`just rfd-board-prune\` to drop these from ` +
+        `\`docs/rfd/.priority.json\`.`
+}
+
 // Each id (`NNN` or `DNN`) must map to exactly one file. Once drafts left the
 // website's validation pipeline it became possible to land two files sharing a
 // draft id; this guards both id spaces.
diff --git a/docs/.vitepress/loaders/rfds.data.js b/docs/.vitepress/loaders/rfds.data.js
index f1715b41f..fc3e8f745 100644
--- a/docs/.vitepress/loaders/rfds.data.js
+++ b/docs/.vitepress/loaders/rfds.data.js
@@ -8,13 +8,17 @@ import {
     checkRequiresOnImplemented,
     checkStatusGate,
     checkSummaries,
+    checkTerminalOnBoard,
     findCycles,
     findDuplicateIds,
     findStrayDraftRefs,
+    loadPriority,
 } from './rfd-shared.mjs'
 
 const rfdDir = resolve(import.meta.dirname, '../../rfd')
+const draftsDir = resolve(import.meta.dirname, '../../rfd/drafts')
 const cachePath = resolve(import.meta.dirname, '../rfd-summaries.json')
+const priorityPath = resolve(import.meta.dirname, '../../rfd/.priority.json')
 
 function loadSummaries() {
     try {
@@ -39,6 +43,18 @@ export default {
         const summaries = loadSummaries()
         const graph = buildGraph(rfdDir, files)
 
+        // The board mixes both id spaces, so the terminal check needs statuses
+        // from both. Drafts are otherwise none of this loader's business: they
+        // contribute nothing but a status here.
+        const draftFiles = readdirSync(draftsDir)
+            .filter(f => /^D\d{2}-.+\.md$/.test(f))
+        const boardGraph = new Map([
+            ...graph,
+            ...buildGraph(draftsDir, draftFiles),
+        ])
+
+        const priority = loadPriority(priorityPath)
+
         // Every validation aborts the published build.
         const errors = [
             checkSummaries(rfdDir, files, summaries),
@@ -48,6 +64,7 @@ export default {
             checkStatusGate(graph),
             checkRequiresOnImplemented(graph),
             findCycles(graph),
+            checkTerminalOnBoard(boardGraph, priority),
         ]
         for (const error of errors) {
             if (error) throw new Error(error)
diff --git a/docs/.vitepress/theme/RfdBoard.vue b/docs/.vitepress/theme/RfdBoard.vue
index 0fae1bdb4..9322cd595 100644
--- a/docs/.vitepress/theme/RfdBoard.vue
+++ b/docs/.vitepress/theme/RfdBoard.vue
@@ -1,7 +1,7 @@
 <script setup>
 import { ref, computed, onMounted, onBeforeUnmount } from 'vue'
 
-import { normalizePriority } from '../loaders/rfd-priority.mjs'
+import { normalizePriority, TERMINAL_STATUSES } from '../loaders/rfd-priority.mjs'
 import { createSortable, isDev, loadBoard, saveBoard } from './board.mjs'
 
 const props = defineProps({
@@ -15,8 +15,6 @@ const props = defineProps({
 // bundle never includes SortableJS and the list renders read-only — the
 // client-facing view.
 
-const TERMINAL = new Set(['Implemented', 'Superseded', 'Abandoned'])
-
 // Marker rows are synthetic list entries: labeled milestone lines plus the
 // unnamed cutoff between the prioritised list and the unsorted backlog. An
 // RFD belongs to the nearest milestone marker below it; anything below the
@@ -75,7 +73,7 @@ function topoSort(list) {
 // backlog, and finally any active RFDs the file doesn't mention. Dependencies
 // are kept above their dependents; the saved order is the tiebreak.
 function buildRows(p) {
-    const isActive = e => e && !TERMINAL.has(e.status)
+    const isActive = e => e && !TERMINAL_STATUSES.has(e.status)
     const placed = new Set()
     const rows = []
     const push = num => {
diff --git a/docs/rfd/.priority.json b/docs/rfd/.priority.json
index 506f4e2c6..645d08c25 100644
--- a/docs/rfd/.priority.json
+++ b/docs/rfd/.priority.json
@@ -4,7 +4,6 @@
       "milestone": null,
       "ids": [
         "065",
-        "045",
         "082",
         "088",
         "087",
@@ -93,7 +92,6 @@
     "D35",
     "D36",
     "D37",
-    "101",
     "D39",
     "D40",
     "D41",
diff --git a/justfile b/justfile
index 7dba3a2d6..d18210c72 100644
--- a/justfile
+++ b/justfile
@@ -882,6 +882,11 @@ rfd-supersede NNN MMM:
     ' "$new_file" > "${new_file}.tmp"
     mv "${new_file}.tmp" "$new_file"
 
+    # The superseded RFD is no longer work to prioritise; the replacement
+    # carries it. Whether MMM belongs on the board is a call for whoever
+    # reorders it, so only the old id is dropped.
+    just _rfd-priority-remove "$old_num"
+
     echo "${old_file}: Superseded by RFD ${new_num}"
     echo "${new_file}: Supersedes RFD ${old_num}"
 
@@ -1557,6 +1562,10 @@ rfd-promote NNN: _install-jp _install-comfort _install-ticket
             done
         fi
 
+        # The board ranks open work; this RFD is done. Drop it so `rfd-list`
+        # and the web board stop counting it as planned.
+        just _rfd-priority-remove "$rfd_id"
+
         echo "${file}: Accepted -> Implemented"
     fi
 
@@ -1791,18 +1800,88 @@ _rfd-priority-rewrite OLD NEW:
         | .backlog = ((.backlog // []) | sub_id)
     ' "$priority_file" > "${priority_file}.tmp" && mv "${priority_file}.tmp" "$priority_file"
 
+# Internal: drop RFD ids from the priority board.
+#
+# IDS are canonical ids (`045`, `D12`), space-separated. Each is removed from
+# every list that can hold it: the `planned` milestone groups, `backlog`, and
+# the legacy flat `order`. Ids the board doesn't mention are ignored, so this is
+# safe to call unconditionally. A missing board file is a no-op.
+[private]
+_rfd-priority-remove +IDS:
+    #!/usr/bin/env sh
+    set -eu
+
+    priority_file="docs/rfd/.priority.json"
+    [ -f "$priority_file" ] || exit 0
+    ids=$(printf '%s\n' {{IDS}})
+    jq --arg ids "$ids" '
+        ($ids | split("\n") | map(select(. != ""))) as $drop
+        | def prune: map(select(. as $id | ($drop | index($id)) == null));
+        (if .planned then .planned |= map(.ids |= prune) else . end)
+        | (if .order then .order |= prune else . end)
+        | .backlog = ((.backlog // []) | prune)
+    ' "$priority_file" > "${priority_file}.tmp" && mv "${priority_file}.tmp" "$priority_file"
+
+# Drop terminal RFDs from the priority board.
+#
+# The board ranks work that is still open, so an Implemented, Superseded, or
+# Abandoned RFD has no place on it and the docs build rejects one that lingers.
+# `rfd-promote`, `rfd-abandon`, and `rfd-supersede` prune the id as they change
+# the status; this recipe is the repair path for a status edited by hand.
+[group('rfd')]
+rfd-board-prune:
+    #!/usr/bin/env sh
+    set -eu
+
+    priority_file="docs/rfd/.priority.json"
+    if [ ! -f "$priority_file" ]; then
+        echo "No priority board at ${priority_file}; nothing to prune."
+        exit 0
+    fi
+
+    # Both id spaces: the board ranks published RFDs and drafts alike, and a
+    # draft can be abandoned.
+    stale=""
+    for file in docs/rfd/[0-9][0-9][0-9]-*.md docs/rfd/drafts/D[0-9][0-9]-*.md; do
+        [ -f "$file" ] || continue
+        basename_f=$(basename "$file")
+        case "$basename_f" in 000-*) continue ;; esac
+
+        status=$(sed -n 's/^- \*\*Status\*\*: \([A-Za-z]*\).*/\1/p' "$file" | head -1)
+        case "$status" in
+            Implemented|Superseded|Abandoned) ;;
+            *) continue ;;
+        esac
+
+        num=${basename_f%%-*}
+        if jq -e --arg n "$num" \
+                '[.planned[]?.ids[]?, .order[]?, .backlog[]?] | index($n) != null' \
+                "$priority_file" > /dev/null; then
+            stale="${stale} ${num}"
+        fi
+    done
+
+    if [ -z "$stale" ]; then
+        echo "Priority board is clean."
+        exit 0
+    fi
+
+    just _rfd-priority-remove $stale
+    echo "Pruned from the priority board:${stale}"
+
 # Mark an RFD as abandoned with the given reason.
+#
+# Accepts: a permanent number (41, 041) or a draft ID (D01). A draft the author
+# has decided not to pursue can be abandoned when the rationale is worth keeping
+# as a record, or simply deleted when it isn't (see RFD 001).
 [group('rfd')]
 rfd-abandon NNN +REASON:
     #!/usr/bin/env sh
     set -eu
 
-    n=$(echo "{{NNN}}" | sed 's/^0*//')
-    num=$(printf "%03d" "${n:-0}")
-    file=$(ls docs/rfd/${num}-*.md 2>/dev/null | head -1)
-    if [ -z "$file" ]; then
-        echo "No RFD found with number ${num}." >&2; exit 1
-    fi
+    out=$(just _rfd-resolve "{{NNN}}") || exit 1
+    rfd_id="${out%% *}"
+    file="${out#* }"
 
     current=$(sed -n 's/^- \*\*Status\*\*: \([A-Za-z]*\).*/\1/p' "$file" | head -1)
     case "$current" in
@@ -1820,6 +1899,9 @@ rfd-abandon NNN +REASON:
     ' "$file" > "${file}.tmp"
     mv "${file}.tmp" "$file"
 
+    # An abandoned RFD is no longer work to prioritise.
+    just _rfd-priority-remove "$rfd_id"
+
     # Remind the user to close the tracking issue if one exists.
     tracking=$(sed -n 's/^- \*\*Tracking Issue\*\*: \[#\([0-9]*\)\].*/\1/p' "$file" | head -1)
     echo "${file}: Abandoned (${current} -> Abandoned)"
@@ -1838,7 +1920,7 @@ rfd-abandon NNN +REASON:
         for r in $(echo "$required_by_line" | grep -oE 'RFD (D[0-9]+|[0-9]{3})' | awk '{print $2}'); do
             echo "  RFD ${r}" >&2
         done
-        echo "Their dependency on RFD ${num} is now broken — review and update." >&2
+        echo "Their dependency on RFD ${rfd_id} is now broken — review and update." >&2
     fi
 
 # Generate or update AI summaries for RFD documents.