Build M1 Garden interaction layout anchors

[JOY]

Parent

• Part of Track alpha demo implementation umbrella #260.
• Follows M0 route skeleton issue Build M0 Garden to Gate route skeleton #280.

Source Docs

• docs/design/128-alpha-route-camera-readability-and-screenshot-gates.md
• docs/design/127-alpha-location-naming-and-map-label-contract.md
• docs/design/118-alpha-m1-garden-interaction-layout-builder-brief.md
• docs/design/112-alpha-map-implementation-slice-order-and-cut-plan.md
• docs/design/115-alpha-map-implementation-issue-split-and-agent-packets.md
• docs/design/87-alpha-garden-hub-spatial-metrics-and-interaction-layout.md
• docs/design/62-garden-facility-actions-design.md
• docs/design/65-garden-npc-anchoring-and-routing-design.md
• docs/design/104-alpha-garden-to-ash-underpass-route-node-graph.md
• docs/design/111-alpha-garden-visual-language-and-material-palette.md
• docs/design/114-alpha-map-playtest-evidence-manifest.md
• docs/design/148-open-design-decision-backlog.md
• docs/playtests/README.md

Evidence Index And Template

• docs/playtests/README.md
• docs/playtests/_templates/alpha-map-slice-M1/

Goal

Build the M1 Garden interaction layout so the player can find and stand at the minimum Garden interaction anchors without UI trigger overlap or NPC blocking.

Allowed Scope

• Clinic / Body Hall interaction pad.
• Repair Row check pad.
• Training Target pad.
• Signal Mast sweep pad.
• Memorial Rail or Notice Wall marker.
• Five focus NPC primary anchor markers.
• Five focus NPC dialogue parking markers.
• Temporary labels, trigger markers, color coding, and clearance markers needed for proof.

Forbidden Scope

• Final NPC AI behavior.
• Complete facility backend logic.
• Final Body Hall UI.
• Full Garden personalization.
• Final memorial content.
• Final art props.
• NPC patrol polish.
• Autonomous ambient conversation loops.
• Combat tuning.
• Ash Underpass interior work.

Acceptance

• Capture M1_01_Garden_Interaction_Layout.png.
• Capture M1_02_NPC_Anchor_Clearance.png.
• Capture M1_03_Training_Target_Read.png.
• Capture M1_04_Pad_Overlap_Check.png.
• Fill interaction pad list.
• Fill NPC anchor list and dialogue parking list.
• Add overlap or clearance note.
• Add Unity console summary if Unity was touched.
• Add promotion-gate-note.md saying whether M2 can start, is blocked, or can start with mock-only caveats.
• Evidence folder follows docs/design/114-alpha-map-playtest-evidence-manifest.md, docs/design/118-alpha-m1-garden-interaction-layout-builder-brief.md, docs/playtests/README.md, and the M1 evidence template.
• Route labels and player-facing map copy follow the current Dayton and TIME-class geography decisions, or clearly mark unresolved wording as blocked.
• No Unity scene mutation happens outside the integration workspace or a locked validation owner.

Notes

M1 should not start final Garden polish. It should make the hub usable enough for later Body Hall, facility, dialogue, and Mission Board work to land without fighting layout ambiguity.

[JOY]

Design handoff is now in the repo. No code or Unity scene changes are required for this issue before implementation.

Primary builder brief:

• docs/design/118-alpha-m1-garden-interaction-layout-builder-brief.md

Evidence template:

• docs/playtests/_templates/alpha-map-slice-M1/

Source docs to keep open while building:

• docs/design/87-alpha-garden-visit-and-selection-loop.md
• docs/design/65-alpha-town-facility-and-yard-layout.md
• docs/design/111-alpha-garden-room-sheet.md
• docs/design/112-alpha-map-narrative-and-identity-pass.md
• docs/design/114-alpha-map-playtest-evidence-manifest.md
• docs/design/115-alpha-map-implementation-issue-split-and-agent-packets.md

Implementation focus:

• Place the alpha Garden interaction anchors and readable staging.
• Keep the loop light: inspect, select, repair or care, prepare for Gate.
• Capture screenshots, pad or anchor notes, and overlap notes in the template.
• Do not expand into full base-building or final roster economy.

[JOY]

Docs-only M1 source recovery is now in the worktree.

Added the source docs and evidence template referenced by this issue:

• docs/design/118-alpha-m1-garden-interaction-layout-builder-brief.md
• docs/design/87-alpha-garden-hub-spatial-metrics-and-interaction-layout.md
• docs/design/62-garden-facility-actions-design.md
• docs/design/65-garden-npc-anchoring-and-routing-design.md
• docs/design/111-alpha-garden-visual-language-and-material-palette.md
• docs/playtests/_templates/alpha-map-slice-M1/

Also linked the M1 lane into:

• docs/SUMMARY.md
• docs/design/03-systems-index.md
• docs/design/115-alpha-map-implementation-issue-split-and-agent-packets.md
• docs/setup/github-project-tracking.md
• ROADMAP.md

Verification:

• tools/windows/check-backlog-sync.ps1 OK
• git diff --check OK
• no generated em-dash/en-dash matches in touched files
• local markdown links OK
• SUMMARY coverage OK for current design docs
• all Build M1 Garden interaction layout anchors #282 M1 source docs and the M1 template entry exist

No Unity scene or code changes were made. This does not complete #282 implementation; it makes #282 buildable by giving the Unity owner the missing layout metrics, facility anchors, NPC anchor rules, visual-language notes, builder brief, and evidence template.