docs(6204): shipped instruction text describes the product, not this instance's records

MCP tool docstrings and comments, the server's orientation notes, the plugin
skills, every hook script and the plugin README/PACKAGING drop record ids,
milestone numbers, dates and incident stories, and state each non-obvious why
as a present-tense fact. History stays in the task logs.

Corrections found on the way:
- plugin README/PACKAGING said every hook is a GET; moment, rule-opened and
  reply-rules POST, so the plugin's key needs write scope. Both now say so,
  name Settings -> MCP Access, and list every wired hook and endpoint.
- the contract-change hint printed "(lesson #4207)", this instance's record,
  to every install. It no longer cites a record.
- tasks.py claimed there is no delete_task; there is.
- rulebooks.py cited delete_event and a design spec that no longer exist.
- scribe_after_write.sh carried an always-empty etag_q; removed.
- test_write_path_trigger pinned "| tac | scribe_defs | head -1", text that
  existed only in a comment about the old code; it now pins the real tail -1
  pipeline.
- docs/development.md: CI runs on Gitea Actions.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

plugin/hooks/scribe_moment.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 # Scribe — PreToolUse moment arm: rules MOUNTED on a moment arrive when the
-# moment happens (milestone 458 step 4).
+# moment happens.
 #
 # The other PreToolUse arms search: they turn the act into a query and hope a
 # rule's words resemble it. A mount needs no resemblance. The operator said
@@ -59,7 +59,7 @@ cache_dir="${TMPDIR:-/tmp}/scribe-moment"
 mkdir -p "$cache_dir" 2>/dev/null || true
 now=$(date +%s 2>/dev/null) || now=0
 
-# ── The acts ledger (milestone 458 step 7) ────────────────────────────────
+# ── The acts ledger ──────────────────────────────────────────────────────
 #
 # Every call, before any filter: `epoch<TAB>event`, one line each. When the
 # session then opens a rule, scribe_record_opened.sh sends the last few
@@ -122,7 +122,7 @@ ledger_q=""
 rule_seen=$(scribe_rules_live "$rulefile")
 [ -n "$rule_seen" ] && ledger_q="&exclude_rule_ids=${rule_seen}"
 ledger_q="${ledger_q}$(scribe_held_query "$state_dir/${safe_sid}.opened.ids")"
-# The reply-shape ledger (milestone 500): a shape this session already holds in
+# The reply-shape ledger: a shape this session already holds in
 # full comes back as its reminder.
 shapefile=$(scribe_shapes_file "$safe_sid")
 shapes_seen=$(scribe_shapes_seen "$shapefile")