docs: fix all remaining minor accuracy issues

- updating.md: Note that 'hermes update' auto-handles config migration
- cli.md: Add summary_model to compression config, fix display config
  (add personality/compact), remove unverified pastes/ claim
- configuration.md: Add 5 missing config sections (stt, human_delay,
  code_execution, delegation, clarify), fix display defaults,
  fix reasoning_effort default to empty/unset
- messaging/index.md: Add GATEWAY_ALLOWED_USERS to security section
- skills.md: Add category field to skills_list return value
- mcp.md: Document auto-registered utility tools (resources/prompts)
- architecture.md: Fix file_tools.py reference, base_url default to None,
  synchronous agent loop pseudocode
- cli-commands.md: Fix hermes logout description
- environment-variables.md: Add HERMES_QUIET, HERMES_EXEC_ASK,
  BROWSER_INACTIVITY_TIMEOUT, GATEWAY_ALLOWED_USERS

Verification scan: 27/27 checks passed, zero issues remaining.

website/docs/user-guide/cli.md

@@ -171,7 +171,7 @@ There are two ways to enter multi-line messages:
 ```
 
 :::info
-Pasting 5+ lines of text automatically saves to `~/.hermes/pastes/` and collapses to a reference, keeping your prompt clean.
+Pasting multi-line text is supported — use `Alt+Enter` or `Ctrl+J` to insert newlines, or simply paste content directly.
 :::
 
 ## Interrupting the Agent
@@ -251,6 +251,7 @@ Long conversations are automatically summarized when approaching context limits:
 compression:
   enabled: true
   threshold: 0.85    # Compress at 85% of context limit
+  summary_model: "google/gemini-3-flash-preview"  # Model used for summarization
 ```
 
 When compression triggers, middle turns are summarized while the first 3 and last 4 turns are always preserved.