ci: bump canonical wrapper SHA pins to current main HEAD (mirror/scorecard/secret-scanner) (#335)

## Summary
The canonical wrappers in this repo (\`scorecard.yml\`, \`mirror.yml\`,
\`secret-scanner.yml\`) self-pinned the **birth SHA** of each reusable
from 2026-05-26, even after meaningful reusable updates landed:

- **mirror-reusable**: #305 added the Radicle secret-presence gate
(\`af5cd0cabd\`) that fixes 26 repos' \`mirror-radicle\` red (e.g.
ephapax#268). The canonical was still demonstrating a pre-gate pin, so
downstream wrappers that mirror this pin couldn't pick up the fix.
- **scorecard-reusable**: #230 aligned canonical cron + #249 SPDX
migration (\`e03686486e\`). Cosmetic, but unblocks the canonical
demonstrating current shape.
- **secret-scanner-reusable**: #236 pragma-honoring fix (\`28fdf197\`) +
#249 SPDX.

Bumps all 3 to standards@main HEAD \`3f34549c\` so the canonical example
reflects the current reusable shape that downstream wrappers should
converge to.

## Fan-out implication
Downstream wrappers currently pinning the 2026-05-26 birth SHAs can now
mechanically refresh their pins to match. Worth its own follow-up
campaign; this PR is the prerequisite (canonical-first).

## Test plan
- [x] All 3 SHAs resolve to existing commits in this repo
- [ ] standards' own scorecard / mirror / secret-scanner runs on PR +
post-merge

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: hyperpolymath

.github/workflows/mirror.yml

@@ -11,5 +11,5 @@ permissions:
 
 jobs:
   mirror:
-    uses: hyperpolymath/standards/.github/workflows/mirror-reusable.yml@e6b2884722350515934d443daf23442f2195796f
+    uses: hyperpolymath/standards/.github/workflows/mirror-reusable.yml@3f34549c03274ec7a74683068f03a492b0fa805f
     secrets: inherit

.github/workflows/scorecard.yml

@@ -15,5 +15,5 @@ jobs:
     permissions:
       security-events: write
       id-token: write
-    uses: hyperpolymath/standards/.github/workflows/scorecard-reusable.yml@e0caf11508a3989574713c78f5f444f2ce5e33ef
+    uses: hyperpolymath/standards/.github/workflows/scorecard-reusable.yml@3f34549c03274ec7a74683068f03a492b0fa805f
     secrets: inherit

.github/workflows/secret-scanner.yml

@@ -15,5 +15,5 @@ permissions:
 
 jobs:
   scan:
-    uses: hyperpolymath/standards/.github/workflows/secret-scanner-reusable.yml@3e4bd4c93911750727e2e4c66dff859e00079da0
+    uses: hyperpolymath/standards/.github/workflows/secret-scanner-reusable.yml@3f34549c03274ec7a74683068f03a492b0fa805f
     secrets: inherit