docs(cli): collapse duplicated walk-flags note to a cross-reference

deps.md and rename.md carried a verbatim-identical paragraph
restating --follow-symlinks + file-discovery semantics (MDS037
flags the pair at a lowered threshold); backlinks.md additionally
re-explained the tri-state already documented in check.md#flags.
Replace all three with one concise sentence that points at
check.md, removing the duplicated prose without adding directive
or config machinery.

mdsmith check . stays green.

https://claude.ai/code/session_01NKdWdyXRSuprJWeLARKvBE

Author: claude

docs/reference/cli/backlinks.md

@@ -30,16 +30,9 @@ entries (`../foo.md`) are rejected with exit code 2.
 | `--follow-symlinks` | config  | Follow symlinks; tri-state — see below              |
 | `--max-input-size`  | `2MB`   | Max file size (e.g. `2MB`, `0`=none)                |
 
-`--follow-symlinks` semantics match
-[`mdsmith check`](check.md#flags). Omit the flag to
-defer to the `follow-symlinks:` config key (default
-skip). `--follow-symlinks` (or `=true`) opts in for
-this run. `=false` forces skip even when config opts
-in.
-
-File discovery follows the `files:` patterns in
-`.mdsmith.yml` and the same `ignore:` rules `check` and
-`fix` use.
+`--follow-symlinks` and file discovery (the `files:` and
+`ignore:` patterns in `.mdsmith.yml`) match
+[`mdsmith check`](check.md#flags).
 
 ## Output
 

docs/reference/cli/deps.md

@@ -29,10 +29,9 @@ with exit code 2.
 | `--follow-symlinks` | config  | Follow symlinks; tri-state — see below     |
 | `--max-input-size`  | `2MB`   | Max file size (e.g. `2MB`, `0`=none)       |
 
-`--follow-symlinks` semantics match
-[`mdsmith check`](check.md#flags). File discovery
-follows the `files:` patterns in `.mdsmith.yml` and the
-same `ignore:` rules `check` and `fix` use.
+`--follow-symlinks` and file discovery (the `files:` and
+`ignore:` patterns in `.mdsmith.yml`) match
+[`mdsmith check`](check.md#flags).
 
 ## Output
 

docs/reference/cli/rename.md

@@ -52,10 +52,9 @@ the conflict. No partial edit is written.
 | `--follow-symlinks` | config  | Follow symlinks; tri-state — see below     |
 | `--max-input-size`  | `2MB`   | Max file size (e.g. `2MB`, `0`=none)       |
 
-`--follow-symlinks` semantics match
-[`mdsmith check`](check.md#flags). File discovery follows
-the `files:` patterns in `.mdsmith.yml` and the same
-`ignore:` rules `check` and `fix` use.
+`--follow-symlinks` and file discovery (the `files:` and
+`ignore:` patterns in `.mdsmith.yml`) match
+[`mdsmith check`](check.md#flags).
 
 ## Output