docs: unify casing and replace path-as-text links across recent doc surfaces

Sweep recent (last ~5h) doc edits for two readability/uniformity issues:

- Replace 42 path-as-text links of the form '[/foo/bar](/foo/bar)' with
  descriptive labels derived from each target page's frontmatter title
  (e.g. '[Anthropic]', '[Token use and costs]', '[OpenAI-compatible
  endpoints]'). Affected files include gateway/troubleshooting,
  concepts/oauth, reference/session-management-compaction, and
  reference/transcript-hygiene.
- Sentence-case Title-Cased headings and link text in Related sections
  across codex-harness, model-providers, tools/plugin, sdk-runtime,
  sdk-setup, prompt-caching, ci, cli/config, google-meet, browser,
  rich-output-protocol, subagents, web/control-ui, while preserving
  brand and proper-noun capitalization (OpenAI, Codex, Chrome, Parallels,
  Z.AI, etc.).

docs/tools/browser.md

@@ -427,7 +427,7 @@ Defaults:
 
 All control endpoints accept `?profile=<name>`; the CLI uses `--browser-profile`.
 
-## Existing-session via Chrome DevTools MCP
+## Existing session via Chrome DevTools MCP
 
 OpenClaw can also attach to a running Chromium-based browser profile through the
 official Chrome DevTools MCP server. This reuses the tabs and login state

docs/tools/plugin.md

@@ -423,13 +423,13 @@ observe results through `after_tool_call`, and participate in Codex
 arguments yet. The exact Codex runtime support boundary lives in the
 [Codex harness v1 support contract](/plugins/codex-harness#v1-support-contract).
 
-For full typed hook behavior, see [SDK Overview](/plugins/sdk-overview#hook-decision-semantics).
+For full typed hook behavior, see [SDK overview](/plugins/sdk-overview#hook-decision-semantics).
 
 ## Related
 
-- [Building Plugins](/plugins/building-plugins) — create your own plugin
-- [Plugin Bundles](/plugins/bundles) — Codex/Claude/Cursor bundle compatibility
-- [Plugin Manifest](/plugins/manifest) — manifest schema
-- [Registering Tools](/plugins/building-plugins#registering-agent-tools) — add agent tools in a plugin
-- [Plugin Internals](/plugins/architecture) — capability model and load pipeline
-- [Community Plugins](/plugins/community) — third-party listings
+- [Building plugins](/plugins/building-plugins) — create your own plugin
+- [Plugin bundles](/plugins/bundles) — Codex/Claude/Cursor bundle compatibility
+- [Plugin manifest](/plugins/manifest) — manifest schema
+- [Registering tools](/plugins/building-plugins#registering-agent-tools) — add agent tools in a plugin
+- [Plugin internals](/plugins/architecture) — capability model and load pipeline
+- [Community plugins](/plugins/community) — third-party listings

docs/tools/subagents.md

@@ -170,7 +170,7 @@ Auto-archive:
 - Auto-archive applies equally to depth-1 and depth-2 sessions.
 - Browser cleanup is separate from archive cleanup: tracked browser tabs/processes are best-effort closed when the run finishes, even if the transcript/session record is kept.
 
-## Nested Sub-Agents
+## Nested sub-agents
 
 By default, sub-agents cannot spawn their own sub-agents (`maxSpawnDepth: 1`). You can enable one level of nesting by setting `maxSpawnDepth: 2`, which allows the **orchestrator pattern**: main → orchestrator sub-agent → worker sub-sub-agents.