[Skills] Directory-based package skill discovery (drop registry table)

[samvaity]

What this does

Switches package-specific skill discovery from a hand-maintained registry table to directory-based discovery, mirroring the approach used in azure-sdk-for-js#38913 and azure-sdk-for-net.

Before

find-package-skill/SKILL.md contained a static Package Skills table mapping each package name to its SKILL.md path. Every new package skill required adding a row to this central table (the create-package-skill wizard had a dedicated "Register" phase for exactly this).

After

find-package-skill now instructs the agent to:

1. Resolve the package directory from the file/package being modified.
2. Check for a .github/skills/ directory inside that package directory.
3. Read every SKILL.md (+ adjacent references/) found there.

Placement is registration — no central table to maintain.

Changes

• find-package-skill/SKILL.md — replace the registry table with directory-based discovery instructions.
• create-package-skill/SKILL.md — update description to reflect automatic discovery; Phase 4 label updated.
• phases/03-validate.md — update Phase 4 reference from "Register" to "Finalize".
• phases/04-register.md → 04-finalize.md — no longer edits a table, just confirms the skill sits in the discoverable location.

Cross-language alignment

• JS: Azure/azure-sdk-for-js#38913 (this PR mirrors)
• .NET: Already uses directory inference
• Python: Will follow

[Copilot]

Pull request overview

This PR updates the Azure SDK for Java GitHub Skills documentation to switch package-skill discovery from a centralized, hand-maintained registry table to directory-based discovery (skills are discovered by being placed under a package’s sdk/<service>/<package>/.github/skills/ directory).

Changes:

• Replaces find-package-skill’s static “Package Skills” registry table with step-by-step directory-based discovery instructions.
• Updates create-package-skill wizard messaging and phase naming to reflect automatic discovery (Phase 4: “Register” → “Finalize”).
• Renames and rewrites the Phase 4 instructions to confirm discoverability rather than editing a central table.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
.github/skills/find-package-skill/SKILL.md	Replaces registry-table lookup with directory-based discovery steps.
.github/skills/create-package-skill/SKILL.md	Updates wizard description and Phase 4 label/link to “Finalize”.
.github/skills/create-package-skill/phases/03-validate.md	Updates Phase 3 prompt and “Next” link to point to Finalize.
.github/skills/create-package-skill/phases/04-register.md	Removes old “Register” phase content that edited the central table.
.github/skills/create-package-skill/phases/04-finalize.md	Adds new “Finalize” phase to confirm location-based discovery and provide summary.