docs: fix 329 Microsoft.Contractions hits with proper safety checks

Apply contraction fixes across ~40 doc files (setup, integrations, lifecycle,
networking, scheduler, swarm, tools, trust-boundary, UI, etc.). Skipped 14 hits:
- 10 where words appear in ALL CAPS for deliberate emphasis (is NOT, do NOT, etc.)
- 4 where text could not be safely located due to markdown formatting or column position

Applied via systematic scan with checks for fenced code blocks, inline code spans,
and intentional caps. Preserves sentence-initial capitalization throughout.

docs/turn-loop/mcp.md

@@ -83,7 +83,7 @@ at_unix_timestamp?)`.
   `cancel_loose_end`. Omit `agent` to list your own threads. Pass
   `agent: "<name>"` to inspect a direct child agent (always accessible
   per topology enforcement); non-children require the
-  `query_agent_state` capability. The `"*"` hive-wide query is not
+  `query_agent_state` capability. The `"*"` hive-wide query isn't
   available on the agent socket.
 - `cancel_loose_end` — hard-delete a `reminder`, cancel a pending
   `approval` row, or clear a `todo` row (loose-ends-v2). Agents may
@@ -139,7 +139,7 @@ hive_name?, swarm_name?, matrix_accounts? }`. `matrix_accounts` is a
   disabled for agents). The repo is created in the c0re-owned `agents`
   org; the calling agent gets write collaborator access; the default
   branch is branch-protected (operator-team must approve merges, so the
-  agent cannot self-merge). Opt-in; not in any default preset.
+  agent can't self-merge). Opt-in; not in any default preset.
   See [`docs/tools/forge.md — Repo management`](../tools/forge.md).
 - **Web egress** (`web_tools`) — enables Claude's built-in `WebFetch`
   and `WebSearch` tools (not MCP tools; added directly to the