fix(labels): restore trusted contributor tier and keep colors unified

.github/pull_request_template.md

@@ -13,7 +13,7 @@ Describe this PR in 2-5 bullets:
 - Size label (`size: XS|S|M|L|XL`, auto-managed/read-only):
 - Scope labels (`core|agent|channel|config|cron|daemon|doctor|gateway|health|heartbeat|integration|memory|observability|onboard|provider|runtime|security|service|skillforge|skills|tool|tunnel|docs|dependencies|ci|tests|scripts|dev`, comma-separated):
 - Module labels (`<module>:<component>`, for example `channel:telegram`, `provider:kimi`, `tool:shell`):
-- Contributor tier label (`experienced contributor|principal contributor|distinguished contributor`, auto-managed/read-only; author merged PRs >=10/20/50):
+- Contributor tier label (`trusted contributor|experienced contributor|principal contributor|distinguished contributor`, auto-managed/read-only; author merged PRs >=5/10/20/50):
 - If any auto-label is incorrect, note requested correction:
 
 ## Change Metadata

.github/workflows/auto-response.yml

@@ -33,6 +33,7 @@ jobs:
               { label: "distinguished contributor", minMergedPRs: 50 },
               { label: "principal contributor", minMergedPRs: 20 },
               { label: "experienced contributor", minMergedPRs: 10 },
+              { label: "trusted contributor", minMergedPRs: 5 },
             ];
             const contributorTierLabels = contributorTierRules.map((rule) => rule.label);
             const contributorTierColor = "2ED9FF"; // Keep in sync with .github/workflows/labeler.yml

.github/workflows/labeler.yml

@@ -55,6 +55,7 @@ jobs:
                         { label: "distinguished contributor", minMergedPRs: 50 },
                         { label: "principal contributor", minMergedPRs: 20 },
                         { label: "experienced contributor", minMergedPRs: 10 },
+                        { label: "trusted contributor", minMergedPRs: 5 },
                       ];
                       const contributorTierLabels = contributorTierRules.map((rule) => rule.label);
                       const contributorTierColor = "2ED9FF"; // Keep in sync with .github/workflows/auto-response.yml
@@ -155,6 +156,7 @@ jobs:
                         "distinguished contributor",
                         "principal contributor",
                         "experienced contributor",
+                        "trusted contributor",
                       ];
                       const modulePrefixPriorityIndex = new Map(
                         modulePrefixPriority.map((prefix, index) => [prefix, index])