docs: document --include-regex and --exclude-regex for snapshot s3 (#216)

Updates the `kosli snapshot s3` CLI reference to document the new
`--include-regex` and `--exclude-regex` path filters introduced in
[kosli-dev/cli#882](kosli-dev/cli#882).

- Mention regex variants alongside literal-prefix
`--include`/`--exclude` in the long description
- Add `--include-regex` and `--exclude-regex` rows to the Flags table
- Update existing `--include`/`--exclude` descriptions to note mutual
exclusivity with the new regex flags
- Add an example using `--exclude-regex '.*\.png$'`

Co-authored-by: mintlify[bot] <109931778+mintlify[bot]@users.noreply.github.com>

Author: mintlify[bot]

client_reference/kosli_snapshot_s3.md

@@ -21,7 +21,7 @@ To authenticate to AWS, you can either:
 Option 1 takes highest precedence, while option 3 is the lowest.
 More details can be found here: https://aws.github.io/aws-sdk-go-v2/docs/configuring-sdk/#specifying-credentials
 
-You can report the entire bucket content, or filter some of the content using `--include` and `--exclude`.
+You can report the entire bucket content, or filter some of the content using `--include`/`--exclude` (literal prefix match) or `--include-regex`/`--exclude-regex` (Go regular expressions matched against the full object key).
 In all cases, the content is reported as one artifact. If you wish to report separate files/dirs within the same bucket as separate artifacts, you need to run the command twice.
 
 To specify paths in a directory artifact that should always be excluded from the SHA256 calculation, you can add a `.kosli_ignore` file to the root of the artifact.
@@ -36,9 +36,11 @@ The `.kosli_ignore` will be treated as part of the artifact like any other file,
 |        --aws-secret-key string  |  The AWS secret access key.  |
 |        --bucket string  |  The name of the S3 bucket.  |
 |    -D, --dry-run  |  [optional] Run in dry-run mode. When enabled, no data is sent to Kosli and the CLI exits with 0 exit code regardless of any errors.  |
-|    -x, --exclude strings  |  [optional] The comma separated list of file and/or directory paths in the S3 bucket to exclude when fingerprinting. Cannot be used together with --include.  |
+|    -x, --exclude strings  |  [optional] The comma separated list of file and/or directory paths in the S3 bucket to exclude when fingerprinting. Paths match by literal prefix. Cannot be used together with --include or --include-regex.  |
+|        --exclude-regex strings  |  [optional] The comma separated list of Go regular expressions matched against object keys in the S3 bucket to exclude when fingerprinting. Cannot be used together with --include or --include-regex.  |
 |    -h, --help  |  help for s3  |
-|    -i, --include strings  |  [optional] The comma separated list of file and/or directory paths in the S3 bucket to include when fingerprinting. Cannot be used together with --exclude.  |
+|    -i, --include strings  |  [optional] The comma separated list of file and/or directory paths in the S3 bucket to include when fingerprinting. Paths match by literal prefix. Cannot be used together with --exclude or --exclude-regex.  |
+|        --include-regex strings  |  [optional] The comma separated list of Go regular expressions matched against object keys in the S3 bucket to include when fingerprinting. Cannot be used together with --exclude or --exclude-regex.  |
 
 
 ## Flags inherited from parent commands
@@ -102,5 +104,12 @@ kosli snapshot s3 yourEnvironmentName
 	--exclude file.txt,path/within/bucket
 ```
 </Accordion>
+<Accordion title="exclude all PNG files in an AWS S3 bucket via a regex">
+```shell
+kosli snapshot s3 yourEnvironmentName
+	--bucket yourBucketName
+	--exclude-regex '.*\.png$'
+```
+</Accordion>
 </AccordionGroup>