chore(ci): replace SourceKnight with setup-sp

[Rushaway]

Summary

Replaces the SourceKnight-based build (maxime1907/action-sourceknight) with a native GitHub Actions workflow using rumblefrog/setup-sp@v1.3.1 (SourceMod 1.12.x), matching the org-wide CI migration already applied to other srcdslab plugin repos.

Plugin targets built

Target	Source file
smac	addons/sourcemod/scripting/smac.sp
smac_aimbot	addons/sourcemod/scripting/smac_aimbot.sp
smac_autotrigger	addons/sourcemod/scripting/smac_autotrigger.sp
smac_client	addons/sourcemod/scripting/smac_client.sp
smac_commands	addons/sourcemod/scripting/smac_commands.sp
smac_css_antiflash	addons/sourcemod/scripting/smac_css_antiflash.sp
smac_css_antismoke	addons/sourcemod/scripting/smac_css_antismoke.sp
smac_css_fixes	addons/sourcemod/scripting/smac_css_fixes.sp
smac_cvars	addons/sourcemod/scripting/smac_cvars.sp
smac_eyetest	addons/sourcemod/scripting/smac_eyetest.sp
smac_hl2dm_fixes	addons/sourcemod/scripting/smac_hl2dm_fixes.sp
smac_l4d2_fixes	addons/sourcemod/scripting/smac_l4d2_fixes.sp
smac_rcon	addons/sourcemod/scripting/smac_rcon.sp
smac_speedhack	addons/sourcemod/scripting/smac_speedhack.sp
smac_spinhack	addons/sourcemod/scripting/smac_spinhack.sp
smac_wallhack	addons/sourcemod/scripting/smac_wallhack.sp

These 16 targets match exactly the targets: list declared in the removed sourceknight.yaml. The _unsupported/ directory (smac_eac_banlist.sp, smac_esea_banlist.sp, smac_immunity.sp) is intentionally excluded, as it was not part of the SourceKnight target list either.

Dependencies

Name	Repo URL	Unpack path (from sourceknight.yaml)
multicolors	https://github.com/srcdslab/sm-plugin-MultiColors	source: /addons/sourcemod/scripting/include → dest: /addons/sourcemod/scripting/include

The sourcemod (type: tar) dependency was dropped, as it's now provided by rumblefrog/setup-sp@v1.3.1 (pinned to 1.12.x).

Packaging

The old workflow copied the SourceKnight package output plus addons/sourcemod/translations/. The new workflow replicates this by packaging:

• addons/sourcemod/plugins/*.smx
• addons/sourcemod/translations/ (all locale subfolders)

No other extra directories (configs/, cfg/, gamedata/, materials/, models/) exist in this repo.

Other changes

• Removed sourceknight.yaml.
• Removed the now-unused .sourceknight entry from .gitignore.
• Updated .github/copilot-instructions.md references from SourceKnight to the new GitHub Actions workflow.

Not locally validated

Per migration guidance, this change was produced without cloning dependency repos, downloading spcomp, or compiling locally. GitHub Actions will validate the actual build on this PR.

Manual verification needed

• Confirm the multicolors include is the only external dependency required by all 16 targets (only smac.sp was observed to reference it directly via grep, but transitively-included headers were not exhaustively traced).
• Confirm the translations packaging path (addons/sourcemod/translations/) matches downstream consumer expectations, since the previous workflow nested it under common/addons/sourcemod/ in the packaged output structure (an artifact of the SourceKnight package layout that doesn't apply to the new flat package structure).

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