fix(foundry): restore foundry-managed-skills symlink target

.github/plugins/azure-skills/skills/foundry-managed-skills/SKILL.md

@@ -0,0 +1,92 @@
+---
+name: foundry-managed-skills
+description: >-
+  Author, version, attach, and consume Foundry-managed skills (SKILL.md as a
+  project resource). Use for azd ai skill, Foundry skills REST/SDK, toolbox
+  attach, SkillsProvider, downloading skills into hosted agent containers,
+  updating agent behavior without code changes, and skill versioning or
+  rollback. Do not use for general Microsoft Learn search, non-Foundry agent
+  frameworks, or Azure Functions/App Service deploy.
+license: MIT
+metadata:
+  author: Microsoft
+  version: "1.0.0"
+---
+
+# Foundry Managed Skills
+
+Foundry **managed skills** store reusable behavioral guidelines (`SKILL.md`) as versioned project resources. Hosted agents download them at startup (or via toolbox attachment) so you can change agent behavior **without redeploying application code**.
+
+This skill teaches the mental model and gotchas, then directs you to live CLI/SDK surfaces for current syntax.
+
+## Pre-Execution Requirements
+
+1. Authenticate (`az login`, and `azd auth login` when using `azd`).
+2. Ensure the Foundry project endpoint is available (`AZURE_AI_PROJECT_ENDPOINT` or equivalent).
+3. Install the skills extension when using CLI workflows: `azd extension install azure.ai.skills`.
+4. Before Foundry MCP operations, discover available tools via the Azure MCP `foundry` surface.
+
+## When to Use This Skill
+
+| Intent | Action |
+|--------|--------|
+| Create / update / list / download / delete a Foundry skill | Follow **Create & version** below, then read [skill-manage](../microsoft-foundry/foundry-agent/create/references/skills/skill-manage.md) |
+| Attach skills to a toolbox for hosted agents | Read [skill-toolbox-attach](../microsoft-foundry/foundry-agent/create/references/skills/skill-toolbox-attach.md) |
+| Load skills inside agent code (`SkillsProvider`) | Read [skill-attach](../microsoft-foundry/foundry-agent/create/references/skills/skill-attach.md) |
+| Broader hosted-agent create/deploy context | Also load `microsoft-foundry` create/deploy workflows |
+
+## Mental Model
+
+- A **skill** is a directory with `SKILL.md` (YAML front matter + Markdown body), uploaded to a Foundry project.
+- Content create/update creates an **immutable version** and promotes it to default unless you pin a version. Rollback via `update --set-default-version` only moves the default pointer (no new version).
+- Agents discover skills primarily via the `description` field (progressive disclosure) — write **when-to-use** descriptions, not vague summaries.
+- Toolbox references without a pinned version follow `default_version`; pinned refs (`skill@2`) stay fixed.
+- `SkillsProvider` downloads the default version at **agent startup** — redeploy (or restart) to pick up updates.
+
+## Create & Version (CLI)
+
+```bash
+azd extension install azure.ai.skills
+
+# Directory with SKILL.md at root
+azd ai skill create support-style --file ./skills/support-style/
+
+# After local edits — new version, promoted to default
+azd ai skill update support-style --file ./skills/support-style/
+
+# Rollback without uploading
+azd ai skill update support-style --set-default-version 1
+
+azd ai skill list
+azd ai skill download support-style
+```
+
+**Gotcha:** `name` and `description` in YAML front matter must be **unquoted**. Quoting them can cause HTTP 500 on import.
+
+## Attach & Consume
+
+- **Toolbox path:** attach skills to a Foundry toolbox so hosted agents receive them as session instructions / MCP-exposed guidance. Details: [skill-toolbox-attach](../microsoft-foundry/foundry-agent/create/references/skills/skill-toolbox-attach.md).
+- **Code path:** use `SkillsProvider` (or equivalent sample patterns) so the container downloads skills at startup. Details: [skill-attach](../microsoft-foundry/foundry-agent/create/references/skills/skill-attach.md).
+- **SDK CRUD sample (preview):** follow the current Foundry sample script linked from [skill-manage](../microsoft-foundry/foundry-agent/create/references/skills/skill-manage.md) — the Skills SDK surface may change.
+
+## RBAC
+
+Skills require **Foundry User** on the Foundry project for both the developer identity and the hosted agent's managed identity.
+
+## Discover Current Syntax
+
+Do **not** invent REST paths or SDK method names from memory.
+
+1. Read [skill-manage](../microsoft-foundry/foundry-agent/create/references/skills/skill-manage.md) for CLI recipes and troubleshooting.
+2. Use Foundry MCP / Microsoft Docs MCP for the latest Skills API shape.
+3. Prefer `azd ai skill --help` and the Foundry samples repo over stale blog snippets.
+
+## Troubleshooting (Quick)
+
+| Symptom | Likely cause | Fix |
+|---------|--------------|-----|
+| HTTP 500 on create | Quoted front matter `name`/`description` | Remove quotes |
+| Agent ignores skill update | Startup download of old default / pinned toolbox version | Redeploy agent, or unpin / bump toolbox skill ref |
+| Permission denied | Missing Foundry User | Grant role on the project scope |
+
+For the full troubleshooting table and versioning rules, read [skill-manage](../microsoft-foundry/foundry-agent/create/references/skills/skill-manage.md).