feat(core): add context provider plugin system

[0x5457]

Implement extensible context provider architecture in core package with 5 browser providers. Add ContextManager for orchestration

• Framework-agnostic ContextProvider interface
• Browser providers: CurrentPage, Tabs, Bookmarks, Screenshot, History
• Contexts passed as structured data to agent
• Delete old context-providers.ts

[github-actions]

Coverage Report for core (packages/core)

Status	Category	Percentage	Covered / Total
🔵	Lines	75.58%	452 / 598
🔵	Statements	75.4%	466 / 618
🔵	Functions	74.5%	114 / 153
🔵	Branches	72.37%	262 / 362

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
packages/core/src/index.ts	0%	0%	0%	0%
packages/core/src/types.ts	0%	0%	0%	0%
packages/core/src/agent/aipex.ts	79.84%	65.34%	84.21%	80.46%	179-205, 265, 272, 285-289, 305, 313, 323-326, 335-343, 345-351, 363, 375
packages/core/src/context/index.ts	0%	0%	0%	0%
packages/core/src/context/manager.ts	97.64%	90%	100%	97.5%	63-64
packages/core/src/context/utils.ts	100%	100%	100%	100%

Generated in workflow #22 for commit 1159e69 by the Vitest Coverage Report Action

[github-actions]

Coverage Report for browser-ext (packages/browser-ext)

Status	Category	Percentage	Covered / Total
🔵	Lines	32.71%	408 / 1247
🔵	Statements	32.52%	418 / 1285
🔵	Functions	28.18%	95 / 337
🔵	Branches	25.75%	180 / 699

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
packages/browser-ext/src/hooks/use-agent.ts	0%	0%	0%	0%	36-110
packages/browser-ext/src/hooks/use-chat.ts	86.59%	80.35%	93.75%	88.17%	127, 154, 180-181, 217-218, 223-224, 263-264, 269, 277, 293
packages/browser-ext/src/hooks/use-tabs-sync.ts	3.89%	0%	0%	3.94%	24-253
packages/browser-ext/src/lib/context/providers/bookmarks-provider.ts	12.12%	0%	0%	12.9%	25-102
packages/browser-ext/src/lib/context/providers/current-page-provider.ts	14.28%	0%	0%	15.38%	25-82
packages/browser-ext/src/lib/context/providers/history-provider.ts	16.66%	0%	0%	19.04%	25-84
packages/browser-ext/src/lib/context/providers/index.ts	100%	100%	100%	100%
packages/browser-ext/src/lib/context/providers/screenshot-provider.ts	28.57%	0%	0%	30.76%	25-53
packages/browser-ext/src/lib/context/providers/tabs-provider.ts	10.25%	0%	0%	11.11%	25-109

Generated in workflow #22 for commit 1159e69 by the Vitest Coverage Report Action