fix(install-e2e): review follow-ups — harness needle, per-matrix cap wording, typo

The harness asserted the driver still throws 'not implemented yet' for
the desktop-installer@latest update route; that arm is implemented now
(Invoke-PhaseInstallGui -Mode "update"), so the check failed against
its own tree. It asserts the implemented contract instead.

The 256-job cap wording in the workflow comment and README now states
the scope GitHub applies it at: each per-OS matrix separately, not the
combined leg count. At the 10-tag bound the largest matrix is windows
at 180.

e2e-screen-record comment: hhttps -> https.

.github/actions/e2e-screen-record/action.yml

@@ -59,7 +59,7 @@ runs:
         command -v ffmpeg >/dev/null 2>&1 || brew install --quiet ffmpeg
 
         # until new runner image is published by github, we have to hack on screen record approvals
-        # see hhttps://github.com/actions/runner-images/issues/14474 - as of this hermes agent commit,
+        # see https://github.com/actions/runner-images/issues/14474 - as of this hermes agent commit,
         # it's merged but the image isn't updated.
         approvalsPlist="$HOME/Library/Group Containers/group.com.apple.replayd/ScreenCaptureApprovals.plist"
         mkdir -p "$(dirname "$approvalsPlist")"

.github/workflows/install-e2e.yml

@@ -97,9 +97,10 @@ jobs:
       - id: pick
         env:
           # Dispatch inputs never touch shell syntax directly: TAG_COUNT
-          # arrives via the environment, is validated decimal-only (bash
-          # arithmetic reads a leading zero as octal), and is capped below
-          # the 256-job matrix limit (15 tags = 270 windows entries).
+          # arrives via the environment and is validated decimal-only (bash
+          # arithmetic reads a leading zero as octal). GitHub's 256-job cap
+          # applies to each per-OS matrix separately; at 10 tags the largest
+          # is windows at 180 (first over the cap at 15 tags = 270).
           TAG_COUNT: ${{ inputs.tag-count || 2 }}
         run: |
           set -euo pipefail