docs: add Helm image tag usage to all agent docs

[chaodu-agent]

Summary

Document --set agents.<name>.image.tag=<version>-<agent> in the Helm Install section of all 9 agent platform docs.

Since v0.9.0-beta.2 introduced the unified image architecture, each agent doc now shows how to specify the image tag with examples:

Tag	Description
beta-<agent>	Floating beta channel
0.9.0-beta.2-<agent>	Pinned to exact version
stable-<agent>	Floating stable channel

Files changed

• docs/kiro.md
• docs/codex.md
• docs/claude-code.md
• docs/copilot.md
• docs/cursor.md
• docs/gemini.md
• docs/grok.md
• docs/hermes.md
• docs/opencode.md

Each doc now includes:

1. --set agents.<name>.image.tag=beta-<agent> in the example helm install command
2. An "Image Tag" subsection with tag format table and link to image-tags.md
3. Warning that there is no latest tag

[chaodu-agent]

LGTM ✅ — All findings from Round 1 addressed in cd2be2b.

What This PR Does

Documents Helm image tag usage across all 9 agent platform docs following v0.9.0-beta.2 unified image architecture.

How It Works

Each doc adds: (1) --set image.tag=beta to helm install example (global tag, chart auto-appends -<agent>), (2) "Image Tag" subsection with tag table showing resolved values, (3) per-agent full override example, (4) warning about no latest tag.

Findings

#	Severity	Finding	Location
1	🟢	Correct Helm path: uses global image.tag (chart auto-appends suffix)	All 9 docs
2	🟢	Per-agent override documented as agents.<name>.image=<full-ref>	All 9 docs
3	🟢	Tag table includes <major.minor> floating format from image-tags.md	All 9 docs
4	🟢	copilot.md comment about optional GITHUB_TOKEN restored	docs/copilot.md
5	🟢	Consistent structure across all 9 docs	—

Addressing Round 1 Feedback

🔴 F1: agents.<name>.image.tag path invalid

✅ Fixed in cd2be2b: Replaced with --set image.tag=beta (global). Added per-agent override example using the correct string field: --set agents.<name>.image=ghcr.io/openabdev/openab:<tag>-<agent>.

🟡 F2: Should document global image.tag as primary method

✅ Fixed in cd2be2b: Global --set image.tag= is now the primary documented approach.

🟡 F3: copilot.md comment removed

✅ Fixed in cd2be2b: Restored as a blockquote note below the code block.

🟡 F4: Missing <major.minor>-<agent> tag format

✅ Fixed in cd2be2b: Tag table now includes 0.9 → 0.9-<agent> row.

Baseline Check

• PR opened: 2026-06-23
• Main already has: docs/image-tags.md with full tag format reference
• Net-new value: Per-agent docs surface correct image tag guidance inline, using the valid global image.tag path