chore(cleanup): remove the June trials, orchestrator docs, dormant agent, caller-less code and the fix-round chain

R4-R7 of the cleanup list (decision 188): the June trial docs and
fixtures, the three orchestrator reference docs, the dormant
synthesis-agent, code with no caller (project-discovery, bash-normalize,
fidelity-diff, test-census, the next-session prompt validator, arm B and
the --workflow flag) and the fix-round chain. Living docs repointed; the
reasons for in-session orchestration and the all-opus pin are now written
in docs/architecture.md and docs/profiles.md.

New tests/lib/living-paths.test.mjs: living tracked text names only
plugin paths that exist (seen red with 22 dead pointers before this
commit). docs/T1-cc26-delegated-orchestration.md and
lib/review/gold-scorer.mjs stay until R-b: the frozen end-state registry
names them.

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

lib/util/research-loop-cap.mjs

@@ -13,7 +13,7 @@
 //       when several callers decide at once instead of only when they queue.
 //   (c) Correct size bound — worst case is max_conv_turns × max_total_dimensions,
 //       where max_total_dimensions is the WHOLE list (interview + discovered)
-//       under settings.json:16's cap of 8 — not × discovered-only.
+//       under the maxDimensions cap of 8 — not × discovered-only.
 //
 // CLAUDE_PLUGIN_DATA absent => fall back to ~/.claude/voyage. The variable is
 // EMPTY in the Bash tool's process env (measured in a live plugin-enabled
@@ -45,7 +45,7 @@ import { homedir } from 'node:os';
 import { isMain } from './is-main.mjs';
 
 export const MAX_CONV_TURNS = 3;
-export const MAX_TOTAL_DIMENSIONS = 8; // settings.json:16 maxDimensions — whole list, not discovered-only
+export const MAX_TOTAL_DIMENSIONS = 8; // maxDimensions — whole list, not discovered-only
 
 const LEDGER_FILENAME = 'trekresearch-loop-ledger.jsonl';
 const CLAIM_DIRNAME = 'trekresearch-loop-claims';
@@ -65,7 +65,7 @@ export function isStormEnabled(env = process.env) {
  * warned about. This is the reader.
  *
  * The ceiling is MAX_TOTAL_DIMENSIONS on purpose: the value that sizes the turn
- * budget IS settings.json:16's maxDimensions, and a second constant for the same
+ * budget IS maxDimensions, and a second constant for the same
  * number is how two readers end up enforcing different bounds.
  *
  * Accepts the dimension list or its count, because Phase 4.5 has the list and