v1.91.290.0 feat(harness): gstack registers its skills in whatever agent harness it is installed into (GSTA-135) (#3526)

* wip: gstack-harness registrar (GSTA-135)

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* wip: harness registration in setup, uninstall, tests

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* wip: harness hosts experimental, troubleshooting codes, kit

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* docs: agent harness registration (GSTA-135)

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* fix: harness hosts run in place from the checkout in --status

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* test: bun-free ledger reader

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* docs: CHANGELOG for harness registration (Unreleased)

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* fix(harness): keep edits beside themselves, never follow symlinks, cut only gstack's own context block

Review blockers on #3526: uninstall deleted the edit backups under the state root;
unregister followed a symlinked folder below the destination; a lone or edited
context marker made the cut eat user lines; a re-register adding --context left an
unrecorded block. Also: ledger written before the files, --refresh-registered no
longer re-runs harness hosts through setup (gstack-harness refresh keeps their mode),
bash goes through runBashSync, and setup tests follow openclaw/hermes becoming installs.

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* fix(harness): a ledger with no destination row touches nothing (no hang)

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* docs: harness registration in README, install and hosts (document-release audit)

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---------

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scripts/host-config.ts

@@ -125,12 +125,11 @@ export interface HostConfig {
     /** How skills are linked into the host dir. */
     linkingStrategy: 'real-dir-symlink' | 'symlink-generated';
     /**
-     * Instruction-only fallback tier: a committed rules digest this host's
-     * users can hand-copy when there is no full install arm. Delivery is
-     * print-path + user-performed copy ONLY — setup must never write or
-     * overwrite a user's own AGENTS.md. See scripts/gen-agents-digest.ts.
+     * 'harness': setup's arm for this host is `gstack-harness register <host>`
+     * (lib/harness-register.ts): the host's render copied into the harness's own
+     * skills folder with an ownership ledger, not linked into a host skills dir.
      */
-    instructionTier?: { rulesFile: string };
+    registration?: 'harness';
   };
 
   // --- Host-Specific Behavioral Config ---
@@ -189,8 +188,8 @@ export function validateHostConfig(config: HostConfig, validResolverNames?: Read
     if (!['native', 'prose'].includes(caps.questions)) errors.push(`capabilities.questions must be 'native' or 'prose'`);
     if (!['enforced', 'advisory'].includes(caps.safetyHooks)) errors.push(`capabilities.safetyHooks must be 'enforced' or 'advisory'`);
   }
-  if (config.tier === 'instruction-only' && !config.install.instructionTier && config.name !== 'slate' && config.name !== 'gbrain') {
-    errors.push('instruction-only hosts must declare install.instructionTier (what setup tells the user to copy)');
+  if (config.install.registration === 'harness' && config.tier !== 'experimental') {
+    errors.push('install.registration harness needs tier experimental (setup registers it through gstack-harness)');
   }
   const modelError = validateModel(config.defaultModel);
   if (modelError) {